See Fiberglass Trilogy I for more on gelcoat
I worte a sort of "child's guide" to fiberglass (partly self education). As pointed out already, gelcoat is merely colored resin with not glass fibers that is used as the outer skin of the boat as a cheaper (better?) method of havig a shiny surface without painting.I would look at what sort of gelcoat damage there is. Could be minor and easily fixed (the odd stress crack) or areas that had been rubbed through by over enthusiastic use of a buffing wheel, rubbing against a piling etc.Trilogy II deals with the type of damage and how it is fixed, including color matching. If the gelcoat is generally shot, it may have to be re-gelcoated or hand sanded out and painted with LPU (usually expenseive if done professionally).Find out what the damage is, and how much it will cost and allow for this in the price.HOWEVER: The gelcoat is really only cosmetic above the water line. On the other hand, blisters (Trilogy III) , are a more serious matter.External, above water gelcoat damaged is less important than things like engine damage, structural damage, need for rerigging etc etc. The only excpetion is cracking due to insufficient structural integrity of the hull.Also consider whether you really like the model of boat and how many more are out there to chose fromHope this is of some helpJim W