Paint not drying

I use hammered paint all the time. I paint the AC faceplates with it and top coat with satin black. Sounds like you put it on too heavy. It usually takes no more than an hour to dry.
 
The sound deadener material ("sdm") is a rubbery petroleum product. It is an incoherent mess of polymers. It could well have absorbed any of the several solvents named on the can's label. If so, the non-drying you're observing is in the sdm, not the paint solids themselves, and you could have a tough time returning it to its normal dry consistency because the 50 year old matrix of acceptable goo has absorbed similar-polarity solvents and isn't letting it go so fast. It is not simple evaporation. Ways to hasten this process: air exchange (run a fan over it) and heat, but not so hot it starts mis-shaping. Sunlight could be effective. Could take a lot of days.

You might steal an inconspicuous sample of the sdm, and take before/after closeup photo of applying a bit of the rustoleum.

Or tear that old crap out and install Dynamat. Much better in all ways.
 
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If it isn't dry by now, it will never dry hard. This is a reaction between the undercoat and your new paint The only way to fix it now is to scrape off all the areas that are not drying and sand out , prime and then paint You can try all sorts of things but ultimately in the end scrape and sand been there done that

Thanks, Rick
 
I had the same issue with red paint fixing some rust in a footwell. Damn paint wouldn’t dry. I got tired of waiting and put the carpet back and underside hession stuck to the paint unfortunately.

It look about 3 months to totally dry but it did dry. The auto paint was well mixed and a good brand. I too couldn’t figure out the problem.
 
I have moved away from the rubberized undercoatings after finding that if the substrate is not perfect, it will remain tacky and that aint good when it is a wheel well. I had cleaned up all the crap and rust in the wells of my M6 when first acquired to later find gravel and sand stuck all over. I ended up using some nasty solvent to remove it all. I stick with bed liner now.
 
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