We used the waterproof variety of tempered hardboard and then painted it up good. Really works fine. I may be able ta get you a few to try out if ya want. I also used some 1/4" waterproof plywood...but with that you have to add a bit of flotation on the underside of the V(actually a Y). They doo work good. Made a couple dozen that we used for 6 yrs before they finally succumbed to some inaccurate shooting....twasn't me really I wouldn't lie to ya..really it hadda be somebody else. Honest injun!!. That is a white blonde haired blue eyed honest injun!! I also made up some decoys with 3/8 waterproof plywood on single t bases..put a little plastic flotation under 'em and they worked ok too. But they can be knocked over when ya hit them with pellets.
Good to see ya posting Del