I just joined the ABS cowl pieces for my AK Models SU-26 .46 Sukhoi kit.
Instead of being in two halves split on the diameter, they are in two short cylinders that need to be joined to make one deep one.
After gluing them together with model cement, I wanted to reinforce the inside with fiberglass to strengthen the glue joint and provide a durable area for the cowl mounting screws.
I used some Goldberg 4" nylon tape to do the job. I bought it a while ago, thinking it was fiberglass, but it's not; it's stiffer and a little harder to work with. I used epoxy finishing resin to wet it.
It wouldn't stay down well over the lipped cowl joint inside the cowl. My idea was to take a latex glove and inflate it inside the cowl to hold it tight to the cowl while it cured. I dangled the glove through the cowl opening and blew it up. I rolled the open end tightly and used a bulldog clamp to keep it sealed up.
It worked perfectly! The cowl looks pretty funny sitting in the shop with the fingers of the inflated glove sticking out the end.... :-)
Good flying, desmobob