Do not get a heat lamp anywhere near your boat. I made the same mistake on a repair I was doing and totally cooked my hull and warped it.
I've seen Sunfish gain over 100lbs from water absorbsion.
Here is a way to dry it out safely.
Buy a long length of plastic flexible dryer hose. Put the dryer hose in the port hole. Dont tape it in just put it in loosely. Also remove your drainplugs or any other ports that you have. Now put a hair dryer set on low on the other side of the flexible hose. Again don't tape it in. Now just leave it like this for a couple of days and your hull will dry out.
Check your temp. in your hulls every hour or so to get the temp right. It should be just warm but not hot.
Mike Hill
www.stlouiscats.com