Kreepa, wurst has a good point believe it or not..
My father was a lifelong boat builder for a living. Several years after retiring (he got lucky and sold his shop in the late 90's), he got bored and wanted to work again, but not hard, just enough to keep his mind busy. Well somehow he got into repairing blisters in spas and hot tubs.. He made a friggin killing, and only worked a couple hours a day at his own pace (disabled vet). When i was younger he would take me to help him, we would gring a couple blisters, fill em, and re paint /match that marbelene color and make $800 a day. And be done.. It was friggin cake ;D