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Preparing the hull
The rudder should be unshipped to allow complete access to it and the surrounding hull.
The inside of the hull should be clean, free of all dirt, grease and oil. All gear and cushions should be removed and the inside of the hull thoroughly rinsed to remove any traces of salt. The bilge should be sponged dry and the water tanks drained.
The boat should be left open to allow the free circulation of air to assist in drying the laminate. A dehumidifier can be used to assist with the drying. This is important, as moisture will penetrate the laminate from inside the hull as well as outside.
There are three primary methods for removing the gel-coat: peeling, sanding or grinding, and grit blasting.
Following peeling the hull must be lightly shot or slurry blasted to remove any soft areas of laminate and key it ready for coating.
Sanding or grinding off the gel-coat with an angle grinder is only suitable for small hulls when the cost of peeling is not justified. Some skill is required to get a smooth surface, but the depth of cut is readily controlled and complete removal of all of the old gel-coat is not difficult. Furthermore, any areas of damaged laminate can be removed during the process. The disadvantage of this method is that in unskilled hands, a grinder may not leave an even surface and a large amount of filler will be required when fairing the hull. A large amount of unpleasant and possibly toxic dust is produced and protective clothing, breathing equipment and goggles are essential.
Grit blasting the hull to remove the gel-coat is not to be recommended. Gel coat is harder than laminate and the blasting grit will gouge holes in the laminate before all of the gel coat has been removed. Consequently the hull will take longer to dry (because some of the gel coat is still intact) and the overall cost will be higher because more expensive filler will be required than had the hull been peeled and lightly blasted.
|Epoxy Resin Guide|
|Coatings Mixing Instructions|
|Osmosis Repair Guide|
|Boat Bottom Areas|
|Boat Bottom Calculator|
|Planning the work|
|Inspecting & drying|
|Floor Coatings & Screeds|
|Steel & Tank Coatings|
|Terms & Conditions|