Concerned about Tire Burn....

[JollySipper]

Hey, Guys.... I recently started an '86 Monte Carlo kit. It had/has a bit of tire burn on the roof. I sanded the spot where it is nice and flat, but it's showing through the primer. Kinda looks a little "shiny" thru the primer where the tire contacted the roof....... I'm wondering if it will continue to show thru the paint as well. I primed it with DupliColor sandable.....

There's not any kind of texture or anything, just a shiny spot..........

Thanks for any help, and tips on how to block it where it won't show in the final paint... I'll be painting it black, if that matters.

[peteski]

The tire burn is caused  by the vinyl plasticizer (thick clear liquid) leaching out of the vinyl tire and getting absorbed into plastic (making it soft).  I suspect that this plasticizer is now leaching from the plastic into the paint.  You might have to dig out the softened plastic, then patch it up with some new piece of styrene and smoothgin it before painting.  Kind of like dentists do when filling a cavity - they first remove all the decayed  material before installing the filling.

Edited March 9, 2020 by peteski

[JollySipper]

Thanks, Pete, man.... There's only a ghost of where the tire was against the plastic..... You think if I put a coat of super glue over the blemish and sand it back smooth, that it would seal in the plasticizer and keep it from leaching out?

[Fat Brian]

3 minutes ago, JollySipper said:

Thanks, Pete, man.... There's only a ghost of where the tire was against the plastic..... You think if I put a coat of super glue over the blemish and sand it back smooth, that it would seal in the plasticizer and keep it from leaching out?

That's not a terrible idea.

[peteski]

3 hours ago, JollySipper said:

Thanks, Pete, man.... There's only a ghost of where the tire was against the plastic..... You think if I put a coat of super glue over the blemish and sand it back smooth, that it would seal in the plasticizer and keep it from leaching out?

Worth a try -- you have nothing to lose, and it would be easier than carving out the soft plastic, then filling the depression.  But super glue will also build up some thickness. If you then sand it smooth, won't that expose the soft plastic again?

How about carving out the soft plastic, then filling the void with super glue (with some styrene shavings mixed in), then sanding it smooth?

[JollySipper]

I believe I was able to hide it, guys....... I just put a couple coats of Perfect Match clear on the roof right over the primer. I could still see it thru the clear, but another coat of primer seems to have hidden it....... We'll see when body paint goes on.

[peteski]

1 hour ago, JollySipper said:

I believe I was able to hide it, guys....... I just put a couple coats of Perfect Match clear on the roof right over the primer. I could still see it thru the clear, but another coat of primer seems to have hidden it....... We'll see when body paint goes on.

Ok, but I'm also hoping that few years from now it doesn't come through the paint to burn you. 

Edited March 11, 2020 by peteski

[gotnitro?]

I was going to suggest Kilz brand primer , available in spray form. Sounds like your back to building though