Estes Phoenix Bird Build Part 10 Epoxy Fillets

Before this step, the fins were filled and sanded with thinned Elmer's Carpenter's Wood Filler or CWF.
For the fins, the CWF was thinned to a brush able consistency.

The body tube seams were also filled with CWF and sanded smooth.

The filler for the body tube seams is mixed thicker as not to diminish the adhesive in the CWF. You want the CWF to stay in the small recesses of the body tube seams when sanding to surface.

Mark the width of the fillets with a dowel marked with a Sharpie pen.

Run the marked end lightly in the recess of the body tube and fin joint.

You'll be left with a faint black line to lay the masking tape edge on.

The masking tape strips are layed down on the faint black lines.
Epoxy will want to go everywhere!
When smoothing the epoxy with the end of a a dowel, the excess will end up on the masking tape.

Here I'm transferring a drop of mixed Epoxy down the joint with a toothpick.

The open width of the masked joint is a good guide for how much epoxy to set down. Try to keep the epoxy between the edges of the masking tape.
If a lot of epoxy is over the tape you are probably putting down too much.