Severe Solvent Pop ???
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I just painted a late model Chevy truck all over. I applied sealer (Omni) and base (UTEC) no problem. I then applied a coat of clear (Single Source 64) and noticed no problems. When I applied my wet coat of clear I noticed what I believe to be severe solvent pop. I initially discarded the clear I was using and replaced with a different batch. Same problem. I then switched to Keystone clear and the problem still exists. The problem is so extensive and deep that water sanding does not seem to be a viable solution. The best solution I have reached is to DA with 80 using a soft interface pad and then again with 180, seal and repaint. Subsequently I DA’d the entire truck with 180 to remove the dimples. I applied OMNI Epoxy primer as a sealer and repainted with Omni base. The problem still exists. What can the problem be? What should I try next? The only constants at this point is the same gun, same booth and same air supply. I painted the roof of this vehicle the day before utilizing the same products and procedures with no problems. Please help….
ya sure it aint air entrapment???? whats ur gun setup
That is a possibility. The gun is a Devilbiss Mellinium that I have used for months but this is the first job I have sprayed since getting it back from being rebuilt. I did not reconfirm the settings. I also have a new Sharpe regulator that is set at 25lbs as recommended by Devilbiss. I used a different gun to spray the sealer and had no problem so maybe this could be the issue. The only problem with that theory is that in my experience “air entrapment” issues can usually be taken care of by sanding. After sanding with 1000 grit I am still left with craters.
holy smokes…just looked over ur pics u wernt kidding when ya said it popped on ya what speed reducers or activators ya using??also what tip size ya got on ur gun
How long did you wait between your sealer,base coat applicatiions.Mixing 3 different products is asking for problems,but we have all done it :woohoo: Where did you spray it?Booth,garage?
Solvent or air trapped in film escapes during drying leaving pop marks.
·Incorrect spray viscosity, spray pressure, flash off time, or improper drying.
· Incorrect choice of hardeners and/or thinners. Use of fast-dry thinner or reducer, especially when the material is sprayed too dry or at excessive pressure.
· Excessive film thickness. Insufficient drying time between coats and too heavy application of the undercoats may trap solvents causing popping of the color coat as they later escape.
· Incorrect drying of primer / fillers.
· Improper surface cleaning or preparation.
· Infrared facilities too close.
· Baking was started too soon after application.
· Baking temperature too highBack to the good old saying. “Too much too soon”
hope this helps. believe it or not, its true
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