incompatible paints one over the other

[gtc73]

Morning all!

Will I need to sand all the way, or can I sand MOST of the way, prime with like a self etching primer, sand and base? or will this be trial and error.....guess cause it's a small piece I can just go for it til I get it right.

Here's the REST of the Story......

Well been here before and no I am back again. I have found out the hard way that when I make a decision to change paint base (ie, solvent types) that is enamel vs urethane I am asking for trouble.

example;
out of nothing more than convenience, because I had run out of my deep black urethane base last year, I grabbed a can of rustoleum gloss black off the shelf and sprayed a couple of small pieces. Man I didn't realize what kind of trouble I was asking for.

So I am in the process of refinishing some of these small parts, as BLAST IT.....when I spray my urethan black base over it, WRINKLES EVERYWHERE!!!!!!:sillyme: what a PIA.

So now I have to sand these small parts pretty much down to bare metal, prime and reapply my black base....what a waste of time, money and effort!!!!!!

 

[Wydir]

Well you know what they say, Just do it right the first time and you wont have to do it again.

But ya I would sand it down and start over.

 

[flashtimes]

Aerosol cans have a HUGE volume of Acetone to act as a viscosity reducer and vehicle to get the pigment and resins out of the can in through the tiny spray tip. That Acetone is a very aggressive solvent that is acting on the substrate causing the wrinkles. I learned the hard way quite a few years ago when I didn't completely remove my problem and start over....I wound up doing the job THREE times. Horrible! Do your self a favor and get rid of the problem by sanding it all off, and start over with the proper technique and products all the way up to the clear.
Be safe...remember your respirator and gloves!

 

[801Rider]

I have had success in spraying 2-3 very light coats, followed by regular wet coats. If you spray to heavy the first few times, I think the chemicals will tend to react. But I'm not a chemist by any means :luck: