HOW DO I MAKE BALSA FILLER HARDER?
I have filled a hole in my firewall with balsa filler and I am concerned that I will chip out the filler with inadvertently knocking the plane around. How do I harden the filler beyond the normal dried state? I have considered soaking it with thin CA. This plane is still in the building stage and I will cover the firewall with thinned epoxy before I am finished. Is this all I need to do or is there a proven method of making filler harder?
Also, since this is on the firewall and very close to my muffler, will it melt with engine heat?