Whats a blister?

[applepip]

excuse my ignorence please.

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[capsco]

Its what you get with new shoes,
Or if it is on a grp hull, probably caused by osmosis, moisture absorbed into the laminate creating pressure forming a "blister"in the gelcoat

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[applepip]

When reading a boat spec they have listed the sails and on two listings they have said Main, genoa, blister --------

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[DanTribe]

Sounds like a misprint of blaster. Some sort of racing headsail I think, as in blast reacher, a jib designed specifically for reaching.
Dan

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[HaraldS]

I think it is close to if not the same as a gennaker.

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[catmandoo]

Is it not a navigation dome like the one you got on old WW2 bombers so that navigator could take a sight with out sticking head in air stream . similar for boat

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[alant]

From a well known 'experts' booklet on the subject
"One version is 'a small swelling filled with liquid".
On GRP hulls, they usually come into various categories:
(1) Gel Coat Void Blisters
(2) Interface Blisters
(3) Fibre Aligned Blisters
(4) Prominant Fibre Blisters ( Wicking)
(5) Inter Laminate Blisters
(6) Fresh Water Blisters
Usually spotted visually by an experienced surveyor, in spite of moisture meters (particularly on a hull just lifted out. Usual concern is 'how extensive? & how expensive?'

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