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GRP shelf life

Joined
27 Aug 2020
Messages
280
Does anybody know if a GRP boat hull can weaken/soften over time?

Does a moulded GRP hull keep its structural integrity for the life of the boat?
 

PowerYachtBlog

Well-known member
Joined
21 May 2007
Messages
3,759
Location
Malta - Med Sea
Bertram, Hatteras, Chris Craft, Magnum in good maintenance from the sixties are still going strong in the USA and beyond. So 50 plus years is confirmed.

What weakens first if the boat is left unattended is the gelcoat.
 
Joined
27 Aug 2020
Messages
280
Brilliant so whats the best practice to keep gelcoat in tip top condition apart from the obvious clean, wax and polish?
 

NBs

Member
Joined
9 Nov 2017
Messages
226
I think there are two reasons for grp "soft" or problem. Osmosis blisters and sandwich grp that has got water in a crack or screw. Almost every boat deck and cabin have a sandwich grp and some boats in Hull, usually just above the waterline. The filling is balsa or foam of various plastics.

NBs
 

Jim@sea

Well-known member
Joined
12 Feb 2010
Messages
3,186
Location
Glasson Dock
I once read (on this forum) about a Quicksilver boat whose hull had become soft having been left on a mooring for a long time but the listing vanished.
 
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