How bad are the bottoms of the hulls? Here are some things to look for and to test the hulls:

Do you see glass? If you press on it hard is it rigid? Is the glass ground flat or does it still have the original shape. Can you see if you have worn through any layers of glass? Do you see any cracks or major gouges? Does the glasswork look smooth and glossy or is there any white or frayed looking glass? Does the boat take on any water? If you put a little water (and I don’t mean fill it up or you may crack the hulls) in the hulls do you see any moisture come through the hulls. If you tap on it does it sound hollow (it should sound like the rest of the boat)?

If the answer to any of the above questions is yes then you may need fiberglass work to repair or build up the hulls. I had an old patch, where the bottom wore through, come loose once and visually it looked good but it was taking on water. When I had some water in the hull I put it on trailer I could see where it was seeping. I stuck a screwdriver in there and the whole patch came off.

I’m not saying that a glass shop is going to rip you off but remember they make money like a body shop get them in and get it out as fast and cheap as possible. Check out your shop the cheapest bid is not always the best, Do not accept any “bondo” type fillers to be used they will absorb water at some point and offer no structural support. Grinding fiberglass sucks.

Good Luck