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Etching Primer - Brass

Which Primer?

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R Johns27/10/2021 18:25:50
41 forum posts

Greetings. I need some advice on etching primer for brass.

I have a spray can from autotek. The back of the can states galvanised steel also suitable for aluminium.

Do I need a different formula for brass? Does anyone have experience as internet searches are inconclusive.

Many thanks

Elmo

JasonB27/10/2021 20:02:30
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21613 forum posts
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I tend to use U-pol's Acid 8 when spraying with a can. Halfords do it . Not used the Autotek

Jon Lawes27/10/2021 20:34:16
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688 forum posts

I tend to use U-Pol Acid 8 for everything as well. It's really rather good. Used it on my locomotive, which was all brass. In the areas that got chipped in transit I touched up without using the primer and it really didn't adhere as well.

R Johns27/10/2021 20:37:10
41 forum posts

Many thanks for the replies.

I see this U-pol stuff is widely available as well. Pointless gambling on the one I have and having to clean everything up.

Regards

Elmo

Martin King 227/10/2021 21:12:19
881 forum posts
380 photos

I have used the Autotek grey etching primer for a long while now and find it to be excellent, mainly on alloy and steel but also some small brass items.

cheers, Martin

Michael Callaghan28/10/2021 10:36:35
16 forum posts

Before spraying make sure that the brass is totally clean. I have also found it helps lightly going over the surface with a scotch pad to key the surface. Acid 8 works ok.

duncan webster30/10/2021 18:15:17
3581 forum posts
65 photos

I seem to recollect that the bumph sheet which comes with Precision Paints primer claims that primer meant for aluminium doesn't have enough acid to work on brass. This might be a case of 'they would say that wouldn't they', and I have little experience either way. I also recollect that the 'how not to paint a loco' book says Acid 8 is OK. My attempts at painting are best described as spreading it around with a hairy stick

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