Adhesive for mat to top of tank suggestions

Hey FABO, what do you guys recommend or use for adhesive of a new insulation mat to the top of a new fuel tank?

1965 Barracuda

Spectra fuel tank and Tank Pad Insulation - .090" Masticated Rubber from DMT

Also, lubricant for filler tube into tank grommet? I read syl-glyde is decent?

Thanks everyone!