I love to use Goop adhesive. It is tough and flexible, totally fuelproof and sticks like crazy. BUT!!! It is a real pain to apply because it is so thick.

Last night, in desparation I tried thinning it with lacquer thinner (the cheap hardware store brush cleaner quality). It worked like a charm. I could apply it with perfect control from the end of a toothpick. It flowed out to a nice fillet. It seems to have retained all its good qualities.

I'm a happy camper, fer sure!