Thanks Joesph, I took your advice and am getting my bathtub re-finished
for $395. Probably about a fraction of the cost of getting a new one.
They will do the whole thing. First they apply a bonding agent, then
the spray-on follwed by finish and buff. The guy said he can do the
whole job in about 5-6 hours, working straight. The other estimate I
got was for $500, and he said he'd come back the next day to buff.
Wonder whether there;s any difference...
Thanks for the advice!