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GRP Boat Repairs (Osmosis?)
GRP Boat Repairs (Osmosis?)
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Davey1000
Davey1000
posted 12 Years Ago
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We are working on an old Colvic Springtide 24 sailing yacht now located in South Wales. The boat was built in the 1960s. It has been on dry land for at least five years but it is now time for it to go back into the water. The old anti-fouling was in a very bad way and needed to come off. Disc and belt sanders were very laborious so a Sealey industrial strength pressure washer was tried. This removed the loose paint but not the hard-stuck paint. Nevertheless it reduced the need for sanding tremendously.
After pressure-washing a lot of little craters appeared (they are not blisters) Typically they are up to 6mm to 8mm across and 2mm to 3mm deep.
A blue water yachtsman advised mixing-up glass micro-spheres with epoxy resin and squeegee-ing the paste over the hull. The problem is that there are so many different types of epoxy resin!
Colvic were famous for making thick strong hulls but the resin was probably polyester. Please could someone advise whether the hull needs sandblasting to "key" the craters (we have a Karcher wet blasting attachment that might be adaptable to the Sealey) One school of thought advises solvent cleaning with acetone as well!
Unfortunately the expert skipper now lives in the Caribbean so he cannot oversee the job.
(Some of the craters look new almost as if the pressure washer has caused them by dislodging loose material. Most seem to be old however but it looks as if the hull is somehow aging)
Please advise as the boat needs to go into the water in the next six weeks.
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Boat
GRP
osmosis
repair
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GRP Boat Repairs (Osmosis?)
Davey1000
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12 Years Ago
Eastcoast fibreglass specialise in boat repairs and have many guides (inc one on osmosis repair) I'd...
FLD
-
12 Years Ago
Hi Davey, If the osmosis is very extensive (which it sounds like it is) It may be worth trying a...
Paul (Staff)
-
12 Years Ago
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