What is the best way to prevent silverfish/woodworm infestation of balsa wood and kits ? Will several naphtalene balls in the box do ? What about building boards made of balsa ? Thanks for the inputs !

Wood worms will not be an issue unless the wood is wet. The worms do not like dry wood.

Silverfish will be repelled by any of the commercial silverfish remedies though the only plans I've experienced problems with were those from very old kits.

John