One is mostly cosmetic. The other is water getting into the laminate. Telling them apart matters.
Gelcoat is the outer, cosmetic layer of a fiberglass hull, and it develops problems that look superficially similar but come from different causes and carry different urgency. Treating one like the other either wastes money or leaves a real problem unaddressed.
Crazing shows up as a network of fine hairline cracks, often in a spiderweb pattern, usually where the gelcoat has flexed or aged. It is typically a surface condition related to the gelcoat itself being brittle or thin in that area, and on its own it is mostly cosmetic.
Blisters are raised bumps under the gelcoat surface, and they generally mean water has worked its way into the laminate beneath it — a process that keeps progressing as long as the hull stays wet. That makes blistering a moisture problem with a cosmetic symptom, not the other way around.
Filling a blister without addressing the moisture underneath just re-covers a process that is still happening. The hull generally needs to dry out and the underlying issue needs to be resolved before a cosmetic repair actually holds.
Crazing without blistering can usually wait for a normal maintenance window. Active blistering, especially if it is spreading season to season, is worth addressing sooner rather than later, since the longer moisture sits in the laminate the more of the hull it affects.
These are different problems with different repairs and different urgency, and a shop that does not distinguish between them in the quote is either not looking closely or not explaining what it found. Either way, ask which one you actually have before agreeing to the work.
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