Joined: 27 Oct 2008 Posts: 83 Location: mid cheshire
Posted: Fri Dec 10, 2010 5:51 pm Post subject: etch primer
I believe that primer is porous and panels left in just primer can become rusty, what about etch primer is that porous as well. Can anyone tell me please. _________________ When I exhibit a car I get the Shudders. People queue up to tell me.
You should have done that, you should have done this. Ray
Joined: 04 Jan 2010 Posts: 74 Location: Haltwhistle.
Posted: Fri Dec 10, 2010 7:48 pm Post subject: primer
In my opinion, it is not good to leave etch, or any other sort of, primer open to the elements. Unfortunatley, Undercoat is also porous.
I would suggest that you etch prime, then as soon as the primer is dry -which since you are applying a thin layer of a chemical treatment, using cellulose thinners as the carrier, drying should take only a few minutes! - put on a thinned undercoat to as this will give a slightly better protection.
On the Berriman's chip van we did just that, and since the etch primer was put on in a very thin coat, it was dry very quickly. And the first layer of undercoat was applied.....and so on up to the final gloss topcoat..... _________________ Saluton. mi estas fervojistino, kaj vi?
to see what has been done! Perhaps we can do something for you?
Joined: 09 Aug 2011 Posts: 3 Location: County Durham
Posted: Tue Aug 09, 2011 10:46 am Post subject:
Use epoxy primer, it isnt porous and can be left for years before paint with no ill effect.
its harder and you have to scotch it to paint over but you can go over it with high build and top coat after
Technically that's not completely correct, Most Epoxies have an overcoating limit, once the limit has been surpassed you would need to abrade the epoxy, and once this is done you are relying purely on a mechanical key, and not a chemical bond, some epoxies will freshen with a solvent wipe but I would suggest talking to the coating manufacturer. You need to remember that most if not all epoxy is resin based, and resin as we know cures and goes hard.
All coatings are permeable in some form or another, so to say they are not porous is not correct, vapor transmission can and does occur in most coatings, even coating that are 100% solids.
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