What the heck happened here?

[JohnC]

These are the AC vent bezels I primed last nice. They looked great this am. I didn’t degrease them because they hadn’t been touched since the red tinted epoxy was applied. I lightly tacked them and sprayed Vaspar base. This wrinkling occurred on both bezels - oddly or perhaps coincidentally it occurred at almost the same orientation on both pieces, kind of the 2:00 - 3:00 position if you are standing in front of the parts. The other pieces that I painted has no such problem. (Other than dropping my freshly painted glove box door - didn’t do as much damage as one would think but edge still needs to be touched up).

The new plastic bezels were sanded with 400, hit with Bulldog adhesion promoter and painted with Valspar epoxy primer last night. The wrinkling definitely happened within minutes after the bases was applied. I think it occurred after the second coat of base.

 

[JohnC]

Pic 1 - parts in epoxy primer yesterday
Pic2- wrinkled paint at 2-3:00. Occurred on both parts

 

[Chevelle_Nut]

Definitely didn't adhere. I use interior trim paint, have had good luck with it.

 

[kmakar]

That's what happens if you spray a lacquer over enamel.

 

[JohnC]

Not sure what happened. One thing I wondered is if there was too much material with the first coat that was still wet and the air pressure of the gun on the second coats caused the still wet material to ripple. I definitely waited the 5-10 minutes between coats but maybe I put it on too heavy?

Only other thing I thought is that perhaps the adhesion promoter didn’t agree somehow with the paint but I would think that would have shown up in the primer coat.

I guess I’ll sand those wrinkles down and reprime and base those areas.

I’ll check the adhesion in the overspray on the sides of the bezels (where it won’t show), but I think the part that didn’t wrinkle should be ok.

 

[1969chevmalibu1969]

That's what happens if you spray a lacquer over enamel.

Does this happen if what you are spraying is either metal or plastic? Or does this just happen regardless?

 

[kmakar]

Does this happen if what you are spraying is either metal or plastic? Or does this just happen regardless?

Regardless.

 

[kmakar]

It'll also happen if you use a slow reducer in enamel or lacquer and then shoot a fast drying (fast reducer) and the slow hasn't flashed off completely.

 

[JohnC]

Well it did it again…. On one piece, not the other. On the piece that wrinkled, I put down 1-2 light coats but there was an area that needed more coverage so I put on a heavier coat and that’s when it wrinkled. It was over 100 degrees out and I guess I thought it would flash off pretty fast and maybe I did t give it enough time.

What I found odd is that when I hit the wrinkle with some sandpaper it exposed the black plastic immediately. In other words it lifted of the plastic even though epoxy sealer was applied. I thought the epoxy sealer would prevent the solvents from getting underneath.

Oh well. The rest of the dash looks good. I still have to blast and paint the ashtray so it’s not a big deal to paint the bezel again.

 

[Shaner]

I wiped down a dash once with thinner. Left it dry for 10 minutes or so, sprayed black and it did that all over the whole dash.

Cleaned all the paint off, wiped again, let it sit a couple hours, came back and sprayed it again, didn't do it.

I find that if I walk away between steps and wait things turn out better.

It's also possible someone used some silicone or sealant on that piece to get it to stick to the dash and maybe you didn't get it all off?

 

[Shaner]

Is this a 69 chevelle?

 

[JohnC]

It's a 67 and the AC vent bezels are new reproduction so no silicone. It eventually turned out OK. What I think happened is that I got a little too eager and put multiple coats of base on without letting it fully flash and solvent got underneath the sealer and lifted it off the part. When I went slower and put my base on slower and lighter coats it was fine.

Not sure that makes sense or not because I'm not sure if the solvent from the base can actually get under the epoxy sealer, but it was clear that the separation was between the part (sprayed with adhesion promoter) and the sealer (not between the base and the sealer). it only happened on those plastic parts and no where else so maybe something about plastic.