Estes Time Warp Build, #7321, Part 9, Upper Fins

The upper fins were filled with CWF and sanded. Then, filler/primer and sanding with 400 grit. Two steps and the balsa grain is filled.

I'll be painting these upper fins off the model. This will save some masking. The upper fins won't break off as the lower fins take the stress on landing.

Estes got it right!

The fin marking guide and alignment drawing are on a separate page of the instructions. There is no printing on the reverse side. You don't have to cut up an instruction page - no build steps on the other side - 

The fin marking guide matched up perfectly.

I wouldn't normally glue fins on this way and wouldn't recommend it for the occasional builder. This will not give you the strongest glue joint. 

The BT-55 mid tube was already seam filled and painted dark gray.

A fin glue line was scraped using an aluminum angle and the tip of a diamond file. Be sure the scraped line is shorter than the top of the root edge length.