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#429710 - 7th Sep 2010 6:23pm Etch Primer
diggingdeeper Offline

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Registered: 9th Jul 2008
Posts: 9761
Loc: Birkenhead
Has anyone used etch primer, I am wondering how real the problem with paint-lift is at the edge of bare-metal and paint?

Is it just a case of try it, if it lifts get the sand-paper out?

Or is it likely to occur and is it best to avoid the edges?

Any other recommends for minor surface rust areas?
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#429711 - 7th Sep 2010 6:29pm Re: Etch Primer [Re: diggingdeeper]
DavidB Offline
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Registered: 7th Dec 2003
Posts: 5595
Loc: Bebington, Wirral
Etch primer is used on aluminium, etc. Have you tried zinc primer. If you treat any surface rust and spray it over, it'll be fine. I treat surface rust with sandpaper, if it's pitted with an angle grinder (and use knifing putty). smile
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#429712 - 7th Sep 2010 6:49pm Re: Etch Primer [Re: DavidB]
chris_gilly Offline

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Registered: 15th Feb 2009
Posts: 1950
Loc: tranmere
i have etch primer its very runny however it premotes adesion, however its really more for had to stick to areas, carbon fibre plastic etc

id just use a cellulose primer if its for your car removing all rust etc.


Edited by chris_gilly (7th Sep 2010 6:50pm)

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#429713 - 7th Sep 2010 7:02pm Re: Etch Primer [Re: chris_gilly]
diggingdeeper Offline

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Registered: 9th Jul 2008
Posts: 9761
Loc: Birkenhead
The advantage of etch-primer is that it chemically changes any remaining rust (only a very thin layer is required), zinc-phosphate primer is just an adhesive unlike the zinc paint we used to be able to get.


Like to sand out as much rust as possible, but there is always a chance of the odd speck re-growing.
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#462884 - 17th Jan 2011 5:04pm Re: Etch Primer [Re: diggingdeeper]
DavidB Offline
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Registered: 7th Dec 2003
Posts: 5595
Loc: Bebington, Wirral
I used zinc primer on my subframe after removing all of the rust, it's really 'tacky' in that you can't really brush it and dries in about 2 minutes (even in this weather). I'm spraying over the top either black or white.

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