: 1. Is there a putty or something that can be used hide the wire tie holes on
: my hull panels.

I have been using epoxy, thickened a little with west systems micro balloons (white)and a couple of pinches of saved up saw dust (from cutting my plywood panels) to thicken it up. I grind up the saw dust as fine as I can using the wifes coffee grinder (she doesn't know about it yet). This makes the epoxy 'putty' conconction pretty close to wood colour. But the saw dust makes for a lumpy putty that doesn't spread so nicely, but sands up ok: That is the price you pay.

Good Luck Pete (Wellington NZ)