so after spending big money of driftwood in past I have found the best piece in my backyard. bark is gone and everything. I am going to scawled and bake to make safe. I have a few piece of DW already with rocks screwed in to weight down, they also have some kind of plastic gel stuff over them were you can actually touch the screws. So my question is, how do i got about doing this or can i get away with water safe screws