BFB,

You can, of course. You should, however, think about it first.

What do you expect out of your deer hair bugs?

I know several guys who really like it when their bugs get a bit 'waterlogged', almost to the point of foundering. The 'sound' the bug makes in this state is diferent, as is how it behaves on the water. They do manage to keep these bugs 'floating' (barely) by occasionally squeezing the water out of them.

But, if what you want is a high floating bug that will stay that way, then a floatant is a good idea.

I'd stay away from the 'on steam' stuff that the trout dry fly guys use, though. Use a permanent treatment like Watershed.

I use a product sold in the camping section at the big box store called 'Silicone Water Guard' that's made for clothing and boots. One treatment with this stuff and it's good forever.

Good Luck!

Buddy