I've decided, for a lot of reasons, to use UltraCote to cover my first build. Will UltraCote (or other coverings) work over sanding sealer or any other applied finishes? I haven't put any on yet, but am wondering if this would be helpful after final sanding and prior to attaching the covering. I realize that anything which seals the balsa will inhibit the absorption of air trapped between the wood and the covering. Also, is that "woodpecker" thing that Top Flite sells a good tool, and a good prep technique prior to covering? I gotta admit - the covering process has me a bit timid.