[Vincentnova]

hello
im working on a old cutlass
the car had an old singlestage paint ( very old )
i sanded the paint , not alway trough just enough to make a good grip
primed , sand everything flat
as usual some little spot bare metal and some old paint spot apparer

degrease tag rak clean everything get ready to seal


now the problem

when the sealer meet the old paint , it's peeling..... right away !!!!!
i used a spi sealer

any idee or suggestion

thanks a lot

[novafreek6872]

"as usual some little spot bare metal and some old paint spot apparer"

Why didnt you go back and spot prime these areas?

Peeling sealer sounds like the car wasnt sanded well enough or the surface is contaminated.

Hopefully experts will weigh in.

Andy

[swvalcon]

Is the sealer peeling or is it lifting the old paint causeing it to peel?

[Vincentnova]

yes it's lifting the old paint ....making it to peeling

[tech69]

strip it or use waterborne primer as a barrier coat. Obviously stripping it is the better choice.

[MARTINSR]

What is happening is the solvents from the sealer are getting under or into the substrate. That substrate being your old paint (very old). It was probably not prepped well when that paint was applied. The substrate under it was likely not sanded well. When this happens and you apply new primer, paint, sealer over it the wet primer, paint, sealer's solvents get UNDER the paint lifting it up off the poorly sanded previous substrate.

As Henry said it really should be stripped. If you wanted to "save" it, you could feather it out with finer paper and apply a product without so much solvents in it like a surfacing primer. Apply it drier so that the solvents don't soak into or under the substrate. You apply a few coats of primer letting it dry a good long time between coats and you create a "barrier".

But honestly, you are playing games doing this as it really should be stripped.

Brian

[Vincentnova]

what kind of primer surfaces ?
when i googled i find only hight builder or sealer.....

[tech69]

a surfacer is another name for high build, if I'm correct. Urethane, Polyurethane, and now some make epoxy highbuild. Really want to try epoxy highbuild and can imagine it's tough as nails.