Believe it or not, after 25 years on Lake George, and another 16 generally un-accounted for on the Mohawk River, Lake Ontario, where-ever, I see some little dead muscles attached to the bottom and a little moss but not one blister. None. Zero. Not even a hint of a blister anywhere, and this hull isn't even painted. It's just a thin layer of gelcoat. That is a huge credit to the quality of resin Chris Craft was using in 1966 (and of course, all through the early years of Commander production too).
By Comparison the Sea Ray Pachanga I sold a couple years ago for an associate (Thank God the Pachanga is Gone thread) had 100 blister for every 4 feet of hull. The entire bottom of the hull looked like tiny little bubbles. The buyer called an expert on his cell phone when he saw them, and the guy told him "it's a Sea Ray, they all have this problem, don't worry about it". In order to fix it, he would have had to heavily sand the entire bottom, probably do an epoxy bonding of some sort, and resand, paint, etc. The quality of the early Chris Craft boats at the onset of their fiberglass production, is still impressive today.