I think I recall that too from back in the day...also that it badly dried out the surface....at least mine doesn't seem to be dried out or chalky at all.
My local Chevy dealer never heard of GB ...so I gotta check out the dealers in the "big city", see if I can find it in stock before I give up and order it online. Tom, thanks for your offer of a piece of cladding. Any chunks are welcome for my experimenting. Think I'll try bleach on one.
Contacted TEN36VX yesterday who used Duplicolor over 3 yrs ago. Said it still looked great, but did have some that chipped off.