My PVC pipe-based bird feeder was spray-painted in a camoflouage(sp?) mixtu re of red, green and brown, and the birds liked it. So did two squirrels w ho actually ate into the PVC pipe around the four openings in the bottom si des of the feeder. I had reused the old plastic opening moldings into the PVC pipe to make it easier for me. The squirrels actually ate some of the black moldings in addition to scratching the PVC vertical pipe.
So, yesterday I took the metal from the side/vertical of a large can of hai r spray and cobbled together two pairs/sets of moldings. Birds seem to lik e it and the squirrels seem to have given up since the new home-made moldin gs extend 1/4 inch back from/beyond the openings in the PVC pipe. To get a t anything other than the food thru the small openings, they will have to d o some serious digging into the smooth PVC pipe surface. Time will tell.