Paint stripper

Advert

Paint stripper

Viewing 25 posts - 1 through 25 (of 47 total)
  • Author
    Posts
  • #565964
    AJAX
    Participant
      @ajax

      I need to remove done paint from various machine parts including cast iron, steel and unknown lightweight cast alloy. I regularly use wire wheels on an angle grinder but on this occasion that's not an option. Can anyone recommend an EFFECTIVE chemical paint stripper that is suitable for machine paints (including enamel paints) and will be safe on these metals?

      From past experience i know the modern formulations sold in DIY sides are useless. Paragon paints sell a "professional" stripper (gramos metstrip) but I don't entirely trust it unless someone here can confirm it works. Additionally, there's the issue of whether it could damage the alloy castings.

      Brian

      Advert
      #33910
      AJAX
      Participant
        @ajax
        #565965
        duncan webster 1
        Participant
          @duncanwebster1

          Caustic soda on the cast iron, but it will attack ally

          #565968
          AJAX
          Participant
            @ajax
            Posted by duncan webster on 07/10/2021 17:40:21:

            Caustic soda on the cast iron, but it will attack ally

            I may give that a try. Any particular technique to use? Can I wash down after with solvent?

            #565969
            Thor 🇳🇴
            Participant
              @thor

              Hi Brian,

              If you can buy sodium hydroxide (NaOH – caustic soda) where you live that may be one option. Cast iron or steel objects should be able to survive a dip in strong sodium hydroxide solution. Wear rubber gloves, safety glasses/face shield (preferably both) and protective clothing. Sodium hydroxide must be handled with care, after use you should neutralize it with acid, strong vinegar is one option.

              Thor

              #565971
              Oily Rag
              Participant
                @oilyrag

                Methyl Dichloride – strips paint off anything (including wood!) but when used with aluminium you need to monitor the process as it will attack the aluminium. I use it for cleaning carburettors as it is the only stuff I know which will remove petrol 'varnish' – the casting come out looking like new after about a 2 hour soak. Works even better when heated. Available from chemical suppliers.

                PS don't breathe the fumes and wash thoroughly in detergent after stripping. Wear PPE.

                Martin

                Edited By Oily Rag on 07/10/2021 17:48:42

                #565972
                noel shelley
                Participant
                  @noelshelley55608

                  As Duncan, and YES caustic soda will EAT alli. Very much depends on the paint type you have ! Noel

                  #565985
                  blowlamp
                  Participant
                    @blowlamp

                    Wilko own brand paint stripper removed some epoxy two-part enamel very well for me. Put plenty on, leave it there longer than recommended and keep knudging it into the nooks & crannies.

                    It was far more effective than the premium brand I tried.

                    Martin.

                    #565986
                    Baz
                    Participant
                      @baz89810

                      I have recently used Dial brand pant stripper which I believe is a brand name of that large diy outlet whose name is two letters of the alphabet. Removed paint from steel and cast iron quite easily.

                      #565987
                      duncan webster 1
                      Participant
                        @duncanwebster1
                        Posted by AJAX on 07/10/2021 17:44:25:

                        Posted by duncan webster on 07/10/2021 17:40:21:

                        Caustic soda on the cast iron, but it will attack ally

                        I may give that a try. Any particular technique to use? Can I wash down after with solvent?

                        I just make up a bath in a plastic container and soak. Afterwards rinse well with clean water. . I use hot water so it dries off quickly. It also degreases, so no need for solvents. As Thor no says, it's unpleasant stuff, so care needed. Make sure you get Caustic Soda, not washing soda

                        #565996
                        Dave Halford
                        Participant
                          @davehalford22513

                          Caustic is also available from yacht chandlers as fibre glass paint stripper, turns the paint liquid.

                          #565997
                          Andy Stopford
                          Participant
                            @andystopford50521

                            Take care when dissolving NaOH crystals in water – the reaction is strongly exothermic and the resulting solution may be hot enough to soften a plastic bucket and allow it to collapse (you may detect the voice of experience here – though it was more of a dustbin than a bucket).

                            Its best to use cold water, and add the NaOH gradually, with stirring.

                            It works a treat, and its cheaper than proprietary strippers.

                            #565998
                            David Jupp
                            Participant
                              @davidjupp51506

                              I've used Biostrip previously – you do have to be patient, and it may take several applications, but it is not unpleasant to work with.

                              Biostrip

                              #566005
                              Speedy Builder5
                              Participant
                                @speedybuilder5

                                Old fashioned car brake hydraulic oil did a good job at stripping paint – don't know about modern oils though.

                                #566007
                                IanT
                                Participant
                                  @iant

                                  I've used 'Paint Panther' with some success on my machines – which have previously been painted in either enamel or Hammertite. I've also used (the much cheaper) 'No Nonsense' paint stripper from Screwfix. This does work but is slower in action and required more coats than Paint Panther. Both need some mechanical assistance (in parts) with wire wool or scraper. I think it also helps to clean any muck and grease off before using the stripper.

                                  Gloves and googles of course and I normally wash the parts down with white spirit after stripping to get rid of any residues. You can probably use other washes ( hot soapy water?) but that's what I used.

                                  Hope this helps.

                                  IanT

                                  #566009
                                  Dave Halford
                                  Participant
                                    @davehalford22513
                                    Posted by Speedy Builder5 on 07/10/2021 19:43:28:

                                    Old fashioned car brake hydraulic oil did a good job at stripping paint – don't know about modern oils though.

                                    Come to that so does Cellulose thinner.

                                    #566011
                                    Clive Brown 1
                                    Participant
                                      @clivebrown1

                                      If you need to use sodium hydroxide solution on, say a vertical surface it can be mixed into wallpaper paste to form a goo that will stay in place better than liquid.

                                      #566022
                                      AJAX
                                      Participant
                                        @ajax
                                        Posted by Thor 🇳🇴 on 07/10/2021 17:44:51:

                                        Hi Brian,

                                        If you can buy sodium hydroxide (NaOH – caustic soda) where you live that may be one option. Cast iron or steel objects should be able to survive a dip in strong sodium hydroxide solution. Wear rubber gloves, safety glasses/face shield (preferably both) and protective clothing. Sodium hydroxide must be handled with care, after use you should neutralize it with acid, strong vinegar is one option.

                                        Thor

                                        Not sure if it's for sale locally, but I can certainly find it on eBay and doesn't see that expensive. I may need to ask about mixing ratios, but I will read through the complete thread first as there are many replies.

                                        #566023
                                        AJAX
                                        Participant
                                          @ajax
                                          Posted by noel shelley on 07/10/2021 17:47:06:

                                          As Duncan, and YES caustic soda will EAT alli. Very much depends on the paint type you have ! Noel

                                          It's rather frustrating that anything likely to work will likely damage the lightweight castings.

                                          #566024
                                          AJAX
                                          Participant
                                            @ajax
                                            Posted by blowlamp on 07/10/2021 18:34:57:

                                            Wilko own brand paint stripper removed some epoxy two-part enamel very well for me. Put plenty on, leave it there longer than recommended and keep knudging it into the nooks & crannies.

                                            It was far more effective than the premium brand I tried.

                                            Martin.

                                            Thanks, that's interesting. The reviews on the Wilko website seem extremely mixed (77 x 5-star vs 20 x 1-star) but I might just give it a try if / when I pass a Wilco. However, I can't find a datasheet and the Wilko website just says suitable for "wood to metal to tile".

                                            #566025
                                            AJAX
                                            Participant
                                              @ajax
                                              Posted by duncan webster on 07/10/2021 18:36:14:

                                              Posted by AJAX on 07/10/2021 17:44:25:

                                              Posted by duncan webster on 07/10/2021 17:40:21:

                                              Caustic soda on the cast iron, but it will attack ally

                                              I may give that a try. Any particular technique to use? Can I wash down after with solvent?

                                              I just make up a bath in a plastic container and soak. Afterwards rinse well with clean water. . I use hot water so it dries off quickly. It also degreases, so no need for solvents. As Thor no says, it's unpleasant stuff, so care needed. Make sure you get Caustic Soda, not washing soda

                                              Hot water for the solution, or hot water for the rinse? I think it has been mentioned elsewhere this solution generates heat so I'm presuming you use cold water when making your solution.

                                              #566026
                                              AJAX
                                              Participant
                                                @ajax
                                                Posted by Dave Halford on 07/10/2021 20:02:23:

                                                Posted by Speedy Builder5 on 07/10/2021 19:43:28:

                                                Old fashioned car brake hydraulic oil did a good job at stripping paint – don't know about modern oils though.

                                                Come to that so does Cellulose thinner.

                                                Well, I have none of that to hand but I do have some acetone and it appears to have absolutely no effect on the paint.

                                                #566028
                                                AJAX
                                                Participant
                                                  @ajax
                                                  Posted by IanT on 07/10/2021 19:44:29:

                                                  I've used 'Paint Panther' with some success on my machines – which have previously been painted in either enamel or Hammertite. I've also used (the much cheaper) 'No Nonsense' paint stripper from Screwfix. This does work but is slower in action and required more coats than Paint Panther. Both need some mechanical assistance (in parts) with wire wool or scraper. I think it also helps to clean any muck and grease off before using the stripper.

                                                  Gloves and googles of course and I normally wash the parts down with white spirit after stripping to get rid of any residues. You can probably use other washes ( hot soapy water?) but that's what I used.

                                                  Hope this helps.

                                                  IanT

                                                  Thanks for the suggestions.

                                                  #566029
                                                  AJAX
                                                  Participant
                                                    @ajax
                                                    Posted by Thor 🇳🇴 on 07/10/2021 17:44:51:

                                                    Hi Brian,

                                                    If you can buy sodium hydroxide (NaOH – caustic soda) where you live that may be one option. Cast iron or steel objects should be able to survive a dip in strong sodium hydroxide solution. Wear rubber gloves, safety glasses/face shield (preferably both) and protective clothing. Sodium hydroxide must be handled with care, after use you should neutralize it with acid, strong vinegar is one option.

                                                    Thor

                                                    Thor, giving this some more thought, can you suggest a mix ratio for stripping paint from iron / steel? You also mention neutralizing it with an acid, but how much would I need? Vinegar is easy to buy but I also happen to have some brick acid if that is useful. (**LINK**) Assume that I know nothing about chemistry and you won't be far wrong.

                                                    #566031
                                                    Pete.
                                                    Participant
                                                      @pete-2

                                                      Not paint stripper, but Bahco Tungsten Carbide scrapers are now my go to for paint removal on cast iron, the 625 is probably the most useful, you'll wonder how you got by without one when you use one.

                                                      I removed a few layers of paint from these castings with ease, it comes off in one scrape, as it comes off in dry chips it's probably one of the least messy methods of paint removal.

                                                      R.press

                                                      R.press

                                                      Large broaching press

                                                    Viewing 25 posts - 1 through 25 (of 47 total)
                                                    • Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

                                                    Advert

                                                    Latest Replies

                                                    Viewing 25 topics - 1 through 25 (of 25 total)
                                                    Viewing 25 topics - 1 through 25 (of 25 total)

                                                    View full reply list.

                                                    Advert

                                                    Newsletter Sign-up