Hull question
 

Does anyone know what is happening when you can feel play in the hull of a boat?
I looked at a boat today and at the aft of the boat by the transome there was a gap, i'm guessing its a seperation between the gel coat (or whatever lesser material used) and the hull itself, but I'm not to sure.
The boat is a 91 17ft wellcraft cc.
Thanks in advance.

a. too many quick starts out of the hole
b..too big of a motor [weight] on transom
C.. transom ply is shot, leaveing only the glass to do all the work
d...deck ply is shot leaveing the glass to hold up the deck.
e...all the above.

Thanks cape,
The price for this boat w/ a blown motor and lousy trailer is $1K or bo. I think I'll keep lookin.