What type of paint is this

[WindyParticipant @windy30762]

I bought a cheap Chinese hydraulic press and decided to strengthen it.

When removing the paint to weld some extra metal in found it had bonded well with the metal and heat to try to scrape it off had no affect on it I had to machine sand it off.

Any idea what type of paint it is please.

[WindyParticipant @windy30762]

[John Stevenson 1Participant @johnstevenson1]

Sounds like powder coating

Edited By John Stevenson on 28/01/2016 09:45:46

[Clive HartlandParticipant @clivehartland94829]

Yes, powder coat where the metal is coated with powder and put through an Infra red heating cycle.

Had the same problem when asked to re-paint Tripods and could not remove the paint coat and new paint would not stick to it!

Clive

[WindyParticipant @windy30762]

What sort of temperature will powder coating take before blistering or becomes degraded.

Does everything have to be conductive for it to adhere to it.

If I could coat my marine ply flash steam hydro hull with it might stand the heat better than some of the other coatings I've used in the past.

[EmgeeParticipant @emgee]

Windy

I agree it could be powder coating because most things seem to be such low cost from China, you say a 'cheap' press so perhaps it's some other paint process that costs less than powder coating.

The process involves spraying powder onto the cleaned and dry metal part then baking in an oven. I leave a full explanation of the process to those with more knowledge of the subject than me but will add the powder adheres to the metal electrostatically, for this reason I don't think you could use the same process on your wood hull.

Emgee

Edited By Emgee on 28/01/2016 13:41:13

[davebParticipant @daveb17630]

I have a scruffy J&S universal vice, fairly sure it's not powder coat, perhaps epoxy? I thought I would strip and repaint it, tried every solvent known to man, nothing touches it. Never fails to amaze me that enough paint falls off to make whatever it is look scruffy but the rest of it defies all efforts to remove.

[Michael ToppingParticipant @michaeltopping17870]

Part of my professional life was managing a powder coating plant. Seemingly a simple process but lots can go wrong. As with all finishing the surface treatment of the part is critical, degreasing and then a treatment in our case a chromate process similar to the etch primer we use on models. With powder it is essential that a circuit exists between the part hanging on the process line and Earth as otherwise the charged paint will not coat properly. Any heating process can be used foe the oven but most use gas for economic reasons. If I remember correctly we baked at 200 degrees fo 20 minutes.

Good powder coating is difficult to remove, ordinary paint stripper has little effect on it.

Michael

[MuzzerParticipant @muzzer]

Whoever wrote the Wikipedia article on powder coating says "Methylene chloride and acetone are generally effective at removing powder coating". No idea if that's right but given that it's usually a polymer, it sounds vaguely sensible.

Anyone tried acetone? Methylene chloride is the stuff used in plastic pipe solvent welding – could try dabbing some of that on to see what it does. Seems to be a suspected carcinogen – like most things these days.

Edited By Muzzer on 28/01/2016 21:00:57

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