A buddy I hunt with bought a garden-variety green johnboat, to fill all his hunting and fishing needs, only being able to afford one boat. No additional paint or camo material was applied. He would set up only a hundred yards or so from the salt marsh bank, where I had my decoys set up, hunting from the bank and being much more hidden than he was. It's amazing how many more divers came into his spread than mine. I'm convinced the birds become shy of the shoreline rather than of blinds a bit into the season after being shot at some. I'm not saying every little bit of concealment doesn't improve your odds to a degree (I've made that same argument about camo shotguns) but it's just not the biggest factor. My best advice is to experiment and see what works for you. As in fishing, I think that's half the fun, rather than following so-called "expert" advice for the get-go.