So far I've been using the IPM board just for counts when sugar dusting, and I've been spraying it with veggie oil cooking spray for that. It is death to varroa mites and a lot of other unwelcome visitors that find themselves beneath the screen. It wipes off with a paper towel and you spray it again. Why bother with adhesives?
The Freeman beetle traps use vegetable oil in their trays. They are effective, but messy, and the smell of it might be attractive to skunks, bears, etc. This led me to some unconventional choices. Already worried about bears but thinking the Freeman traps sounded otherwise good, we built a veritable fortress around the hives, a cage that would hold a tiger, ringed by a fanny-kicking electric fence. Some people use the Freeman trays with veggie oil spray and say they work just as well, with less mess.
To get back to the varroa question, for sugar dusting to be effective, it needs a SBB so the varroa mites drop out of the colony when they fall off the bees. But an open SBB is awfully drafty, so a sticky board, oiled IPM board, or oil tray under it blocks the draft, and also kills varroa mites and SHB. More to the point, some form of easily cleaned death trap board or tray is essential in mite drop counts. Without some form of determining mite load, and finding out if any measures you take are doing any good, everything else is guesswork.