That's probably it - it's been twenty years since I used it; as for cowlings, I believe I sanded the narrow overlapping flange and corresponding area on the mating parts, cleaned with alcohol, then assembled dry with masking tape over the outside holding the cowl together. Flowed the "Poly-Zap" into the seam from the inside of the cowl resting the tip on the overlapping flange and using it as a guide while moving the bottle along the length of the parts to be bonded. Ensure parts are in full and complete contact before glue sets. Some ingredient in the glue seemed to work like plastic model airplane cement in that the parts appeared to "weld" together. Note: I never used this glue for any plastic to laminate skin bonds so I don't know if it works there or not...