I use thin CA when I want to quickly bond two pieces of balsa together that WILLNOT require sanding later. Thin CA is extremely fluid and will run everywhere if you apply it too liberally. For thin CA I use applicator tips that limit the flow. Yes, thin CA will absorb into the balsa but that's good when joining two pieces together. That's what creates such a good bond.

I use medium CA when I want a little more time to work but not wanting to waitsay aslong as wood glue would take to dry. Again, Idon't use CA when I wantto sand later. I use Elmer's Carpenter wood gluewhenever possible, especially for sheeting,and for sure when sanding is involved. CAis just nasty stuff and dries hard as nails.

I use epoxy(5 or 30 minute variety) whenjoiningwing halves together.Epoxy goes on thick and dries thick. I wouldn't useepoxyon wood that will see covering. It's a pain tosand as well.I use Epoxy on firewalls, and for the horizontal and vertical stab areastoo.

For general repair, most cases youcan use thin or medium CAto mend balsa. If it gets on your fingers use WD-40 or gasoline to clean it off right away. Don't sniff the fumes either.