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OK, i tried to get some product info on these adhesives. So far I found that the Evercoat Vette Panel adhesive is for bonding fiberglass only (found on Evercoat's website):
Vette Panel Adhesive/Filler™
A polyester body filler for fiberglass and SMC panels. No shrinkage. Helps prevent repair mapping on seam lines over fiberglass repairs. Used to bond fiberglass panels only, not SMC. Blue cream hardener included.
All the other adhesives from 3M (8115, Duramix) require a mixing gun, these sell for $80-$120
The only adhesive that is supposed to work on SMC AND comes in a qt container is this:
SMC Panel Adhesive
The only polyester adhesive strong enough to bond small SMC panels. Repairs small areas on SMC or fiberglass surfaces. May be reinforced with fiberglass mat or cloth. Has superior moisture resistance and lasting strength. Blue cream hardener included.