JM 1 Custom Kit

[Freakystyley]

You reckon I should go over the whole body or just the runs and specks? There are only 3 or 4 areas? I have enough spray for another 2 coats I think

[wazkelly]

Would always suggest a light wet sand across all surfaces as that helps the next coat attach rather than just focus on small problem areas that may stand out after applying a fresh coat.

[phrozin]

what Waz said

[Freakystyley]

Well I got the colour coats on and was happy enough. Put the lacquer on and the first coat was fine but after the 2nd I noticed patches like this. Pot life of the lacquer was 8 hours so couldn't do anymore. It's still curing in a cupboard. I'm just hoping a light wet sanding and polish takes some of it out. Any other advice?

[Simon Barden]

What lacquer are you using? If you used nitro for the blue, then I'm assuming clear nitro for the lacquer?

[Freakystyley]

Yeah, 2k spray max clear gloss.

[Simon Barden]

Which may be the reason, as that (to the best of my knowledge) isn't a nitro lacquer but an acrylic one. Whilst some paint types are reasonably compatible with others, I'd always promote sticking to using the same paint type throughout to avoid reactions. I'm no expert here, but I do know that some paint type combinations just don't work. And it may even be down to different manufacturers products as to what they put in each can. It only takes one component in the paint or solvent to react and that's the finish ruined.

I believe you can spray nitro over a fully cured poly finish, but probably not the other way round.

[Sonic Mountain]

Ugh. Unfortunately as Simon said, this is the result of incompatible paint types. You need to use the same products for primer, base and top coats.

I would suggest giving it a really good sand back once its dry, and then leaving it a week or so for all the solvent to dry out. You might then be able to use the original primer to seal over and start again.

Real bugger, but you're not the first to make that mistake.

[Freakystyley]

A real bugger is correct. The primer and gloss are from the same company. The colour is rothko and frost. Definitely the gloss lacquer and colour are both nitro but as simon says i guess it could be some component in either that has reacted. It is only on 2 patches, the rest looks awesome. the primer and the lacquer both have hardener and only had an 8 hour pot life so sanding back and redoing will involve more money 😢 Best to let it sit for a week before sanding?
My only question is do u guys think it was definitely not from the first coat being too dry?

Also thanks for helping a noob, I will have to be more careful picking sprays in future

[Sonic Mountain]

It is interesting that it has only happened in a couple of spots. Is there any chance there could have been some kind of solvent or oil in those areas?

Otherwise, this can also happen if the previous coat was too thick. The top can feel dry and hard, but underneath hasn't cured properly, so painting over again, even with the same kind of paint, will re-activate the semi dried out bit and make it crinkle.

Most paint is made up of primarily 3 ingredients - the pigment for colour, the binder for making it stick, and the solvent for keeping it liquid until its applied and then drying out (or out gassing) to leave the finish. So if the solvent gets on a semi dry bit of the paint, it tries to dissolve it into a liquid again.

I would sand the top off just those two areas and then leave it for a week to out gas. You want to make sure as much of the solvent (in the paint itself) has dried before doing anything. If you've used compatible paints and its just a case of the lower coat not drying out fully, you should be fine to just do another couple of coats on top and sand back to fix it. If its because of a reaction between incompatible paints (usually the solvents don't like each other) You would be best to sand until all evidence is removed, because. sometimes even the slightest residue will cause another reaction.

I know its super annoying and its happened to me plenty of times (I once had an entire car crinkle up because I bought the wrong top coat) but its not the end of the world and it is fixable.

Overall patience is the key. The longer you leave it between coats the better really. Most paints specify something like within 1 hour or after 24, if I'm past the initial coating, I try and leave it a week.

I understand the frustration - I made a silly mistake on mine and ruined about 2 weeks of drying time.