RE: SIG Fourstar 40 (4*) Build Thread
I followed mclina's advice and added triangle stock to support the vertical stabilizer.
Shown are gaps that will be filled in with Expoy and Micro Balloons.
Then you see the gaps filled with 30 minute epoxy (picture says 20 but it is 30) mixed with the Micro Balloons.
Next you see the strengthened area slightly sanded, ready to be covered.