I'm doing all the prep work on my car myself as and when I can over a couple of months. Trouble is i dont want to be leaving it in primer. Does anyone have any recomendations for a good impermiable rust prevention coat. I've been suggested - Por 15 metal ready, then Por 15, Then primer, then it'll be ready for a top coat.

any advice would be much appreciated.

ash

por15 is the shizzle

Yea it won't be cheap, but say bye to rust..

Por 15 ftw!

Por 15 it is then I guess. Its about £25 a litre from frost, so not too much for peace of mind.

cheers.

ps is it necessary to fully remove the black transport coat off new panels?

Not normally,unless this Por 15 is made only for bare metal? Sounds like it is,so id ask Frosts about that. Otherwise,you dont want to remove it. Just remove the surface layer,the gloss. Dont worry about going through to the metal if you do,but its better left on. That is,when just using etch primer.

bare metal - etch primer.....

Edited 19 July, 200719 yr by poloscunny

on the lower body sections and engine bay on my GT, I primed them with POR15, with the thinking that it should be an impervious barrier rather than porous (if I used normal primer), and then overcoated the POR15 with primer My thinking was that if I get scratched and chips in the paintwork, it wouldnt then matter if they went down to the primer as the POR15 would stop any moisture getting to the base metal to prevent rusting.

primer is porous, so if it gets exposed to moisture it slowly absorbs it, as it works like a sponge, so the rusting can spread quiet quickly.

on the lower body sections and engine bay on my GT, I primed them with POR15, with the thinking that it should be an impervious barrier rather than porous (if I used normal primer), and then overcoated the POR15 with primer My thinking was that if I get scratched and chips in the paintwork, it wouldnt then matter if they went down to the primer as the POR15 would stop any moisture getting to the base metal to prevent rusting.

primer is porous, so if it gets exposed to moisture it slowly absorbs it, as it works like a sponge, so the rusting can spread quiet quickly.

Sounds exactly how i'm thinking. Did you find it successful? Did you use the por15 metal ready first?

are you intending on taking the car to a bodyshop fro the top coat to be laid one you've done all the prep work?

If so don't do anything till you've spoken to the bodyshop you intend to go to and ask them what they'd prefer you to prep it with and how to do it (if they'll even give you this info). Otherwise they could end up having to un-do all the work and painting you are about to do and the job will cost you a lot more than if you just took the car in as it is now for a respray. If the paint they use doesn't sit on POR15 well they could have to strip it off and POR15 doesn't come off easily, it dries very hard.

Just use your local paint suppliers etching primer, flat down and wag over with normal primer...

I only used metal ready in the rusty parts. I applied the por15 one day then primed and painted the car normally the next day. I think you can get a coating for use on top of por15 once its hardened though.

like hayesey says, talk to your bodyshop first as they may take no responsibility if the finish isnt right after you've prepped it.

I dont use por15 anymore, as I've found that its not as good as it says on the tin, but that might just be on my car

Thanks for the replys, Theres not really any rust on the car so its mainly the non-porous quality i'm after. Is etch primer Porous?

thanks

it doesnt let water in - no...

primers are normally porous and the etching primer I normally use definately is

yeh etch primer is. you only really need etch for bare aluminium, wont really make odds on steel