Ya know Larry, I have tried a couple of things to prevent water logging and I have found that switching flys is better for me. I can't remember exactly which products I tried, but I know one was from Loon, flexcoat may have been another. They build up pretty quick and weigh down the head of the fly. I think paint works well for bigger bass poppers, but the mini popper heads we use for SRC can't support very much build up. That's been my experience anyway. Steve Rorhbach was coating his slider heads with a loon phosphorescent for a while and it worked pretty well. But I found my fly would dive more often than skate, so I stopped experimenting.
I switched to a light synthetic for the tail and tying them a bit more sparsely and it keeps them afloat longer, but like Steve said sooner or later you still end up just swapping them out for a dry one.
I coat all popper heads with Hard-As-Nails and use either clear or pearl sparkle bottles. I push a toothpick through the hole in the poppers and use the brush in the bottle to apply. The popper heads can be dried by putting the toothpicks in the openings(6) on the side of tying thread spools, foam block, etc.
The Hard-As-Nails seems to be indestructible and is easy to apply(20 seconds or so). I put eyes on many popper/slider patterns and the Hard-As-Nails keeps the eyes from coming off. In many years of use, eyes have never come off.
Popper heads like the Rainy's heads which Leland uses are made of firm, closed-cell foam and will float forever without coating or any additional treatment. So, unless you feel the need to change the color or some other requirement, leave them alone. My own opinion is that the primary ability of the popper (or slider) to attract strikes is the waking pattern it causes on the surface simulating the wake that might be created by a wounded baitfish. A fish, looking up at the popper sees it only in silhouette and is probably unaware of its color.
Hmmmm, I have plenty of old urethane foam chunks lying around, from when I used to shape/build some of my own surfboards. That stuff is closed cell. Perhaps I can shape my own popper heads.
I have access to more scrap chunks of foam, since I am friends with 3 surfboard shapers, and they just throw the smaller chunks away. There's just too much left over scrap generated from shaping a board, to save it all for ding repairs.