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Try “tack free” type body fillers.

Edit:

The surface gumminess often associated with non tack-free polyester fillers is due to loss of heat generated from the exothermic reaction which often results in the outer surface not curing fully.

Tack-free polyester fillers are paraffinated, and the paraffin behaves as an insulating blanket which traps heat, allowing for the surface to fully cure which otherwise wouldn’t with non-paraffinated fillers.
 
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