Question about a reaction/wrinkling

RosharonRooster

RosharonRooster

Promoted Users
unfortunately I dont have a picture to show but here's what happened.

My buddy had some new 94-96 impala mirrors. They are plastic. Brand new. Here was his process.
600 grit.
Bulldog adhesion
2 coats spi black base
1 coat production clear.
Had a dirt nib ....went to sand it out and burned thru (told him its dangerous sanding 1 coat of clear)
No problem its just a mirror. ..scuffed with red pad and reshot basecoat and it wrinkled....he called me asking what to do. I told him to sand it and spray it with epoxy. Then rebase and clear it again.

Its fixed...but the question is with so few materials used and a pretty basic process....what caused the wrinkle?
 
That's typical for a break through repair, either prime the spot to lock the edges down
or use a fast reducer and spray light coats of base letting flash a long time between coats.
Putting a little activator in the original base coat helps eliminate that problem for future repairs.
 
Agree with activator in base.
Agree with one coat of clear not being a bright idea, especially if you see that it will need buffing.
Even if activator is used in the base, repairing a burn-through directly with base is going to be scary unless it's aged paint. A couple coats of primer is always the best plan, 2K urethane with Polar being the quickest safe way.
 
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