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Everyone has their own way of doing things…the steps I follow have given good results
1) wash out tank
2) remove studs
3) split tank open
4) remove old gasket and adhesive
5) smooth and level flanges
6) wipe flanges with lacquer thinner
7) trace tank on gasket stock
8) apply sealant to flange and outline traced on gasket material
9) allow sealant to become tacky then clamp tank half to gasket
10) next day unclamp and trim gasket
11) install studs, apply sealant to flange and to gasket surfaces
12) allow sealant to become tacky then assemble tank
13) tighten nuts on studs and set tank aside to cure
14) trim excess gasket and sealant
15) TEST by blowing in fuel filler opening with finger over outlet.
Seal-All is gas, oil and coolant resistant…old school product
Karropak gasket material in 1/32″ part # 3046 will do 2 tanks
Louis