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We have discussed many ways of providing for bubble-less BID layups,
everything from standard fiberglass mat air-rollers, to cutoff brush
technique, to the Lancair-suggested bolt-roller, to using a pin to coax out
tiny air bubbles, ad nauseum.  I thought I had my technique perfected and
have been mostly happy with my results, but found a far superior (for me,
anyway) method of getting a great wetout, one that worked MUCH better than
anything I'd tried previously.  

I was doing the 8-BID layups (performed as 2- 4-BID ones) on the flap
acutator bulkheads (and much prefer individual layups to multi-thickness
ones done plastic-sandwich style, especially for something this thick) and
found that a 4" length of plain old hardware store variety 1/4-20 threaded
rod rolled back and forth over the layup with my fingertips gave me much
greater control and probably the best layup I've done since I started my
project.  I wish I'd been doing this all along, the results are truly
amazing.  Try it, you'll like it.

   <Marv>