There were quite a few posts on this back in April (2007).
http://www.tackleunderground.com/forum/showthread.php?t=9102
I used to use this a lot (years back) with auto primer/sealer and it worked pretty good, never had a problem with lures blistering in the sun, which when selling them is your worst nightmare. I have tried it a couple of times with Prop and it seems so good on the wood I use, I just dip now because my jar would not all ways seal. Years ago I tried the penetration thing with wood stain and had the same result as "PalmettoBalsa", weighing seems to be the only 'telltale' on smaller lures, you can feel the difference in weight. pete