Scavenger! Build Part 20 Epoxy Fillets

Here's a technique I don't have enough experience with!
Epoxy fillets, like any new technique take practice.
Normally I do built up white glue fillets, sometimes I use Titebond Molding and Trim Glue for fillet work. On a rocket this size, the radius (or roundness) of the fillet should be larger.

I'll try to tackle this a little like the MPR guys do.
Masking tape is set down around the fillet areas.
The tape will keep the surrounding areas cleaner. Epoxy tends to get everywhere.

The round end of the Popsicle stick will be used to round the fillet and remove excess.

Be sure you have everything at hand before starting. You don't want to be hunting down anything while the epoxy is hardening up!

You'll need Nitrile disposable gloves, rubbing alcohol, your fillet forming Popsicle stick and plenty of paper towels.

Equal amounts of epoxy (in my case 15 minute epoxy) were set on waxed paper.
I don't mix a lot of epoxy, the A and B parts were about the size of a quarter when they started to spread out and touch in the middle.

You are working against the clock, you'll only be able to fillet two facing fin root edges at a time. Let them dry and mix more to do the next set of facing fins.

This 15 minute epoxy might cure too fast for some builders.
You might have better luck with 30 minute epoxy the first time you use it.

Thoroughly mix parts A and B. Try to keep it central, in a small area when mixing.


I transferred the mixed epoxy onto the root edge area with a toothpick. Enough was transferred to be smoothed with a gloved finger or rounded stick.
Keep the epoxy on the root edge area. Chances are, ther'll be "stringers" and a few stray drops here and there.

Continued next post: