Classic cars forum & vehicle restoration.

[clascar]

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.
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[Phil - Nottingham]

It is not porous but its not a good idea to leave it unpainted as the surface will harden and the new paint will not key VERY WELL AT ALL
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[StoneRoad]

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.....
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[michael1703]

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

[SodaBradeUK]