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i have never used that primer so i can't give you exact comments about it. the primer is gray correct?
with a 2K primer it will cure slower if you don't use proper flash times.
i know with other PPG heavy solid primers similar to this stuff won't properly cure without using a heat lamp.
my suggestion is to get the car in the sun to bake it. or get out a heat lamp to give it a full cure.

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Yes, a light gray polyester primer.

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sounds like you didn't mix the Omni properly?,....I usually use the Evercoat G2 polyester primer/fill, pot life is only 15-20 minutes, so if it don't set like rock within that time frame you know you did something wrong, mix wise,....or perhaps the mat'l was frozen at some time before you used it, if you can't cure the car in the sun, or a heat booth,....time to scrape it off,...IMHO avoid the OMNI line, I have little love for PPG products, Omni is rock bottom as far as quality though, much like the Nason brand line is junk for Dupont,....Evercoat is perhaps your better line for polyester resin primer/fill sprayable products,...sucks to have the situation your at, but better to remove it now, than after trying/hoping it will cure under the paint, which will just be a bigger mess down the road

Mike

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Hoping to find some piece of mind

Sprayed OMNI MX241 (PPG) primer filler on my resto Saturday afternoon. Clear and ambient temps although not hot... 70 degrees tops. Car was stripped with media initially and sprayed with DP40, scuffed and body work started. Once complete, another coat of DP40 was applied, cured and scuffed with 80 grit, body was wiped with wax and grease remover and then wiped with isopropyl alcohol. I sprayed the MX241 primer filler and tonight (approx 48 hours since application) I started knocking it down with dry 180. It sanded and did not clump however in a couple areas I sanded through the MX241 to the DP and noticed that I was able to scrape the MX241 with my finger nail. The material is soft at the surface. The areas I did not apply more that a single coat are hard and set and do not have these indications. I mixed the hardener per the spec sheet and used approx 10 - 15% PPG reducer. I am guilty of not waiting the full 20 minutes between coats in some areas. My concern is whether the material will harden over time. right now I am a bit freaked as to the idea of having to take it back down and start over. Ugghhhh

Temps have not been much above 70 since I shot the car. Was thinking of turning the heater on to see if that would help it harden.

Any insight would be most appreciated.

Thanks

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