DAP "Fast n Final" lightweight spackling
Best lightweight balsa filler I have ever found. Easy to apply, easy to sand ,paints very nice.
I mix it with water till I have the consistency of a thick milk shake for making fillets,put some on myfinger and quickly pass over the area to fillet. Best part is if you don't like it, wipe it off with a wet rag !!
I use it as it comes for general filling of dings and boo boo's!
Try it you'll like it ---Bob