How to fibreglass a pond.. Fibreglassing This is the final stage, flowcoating. Apply it to one wall at a time with a lambswool or polyester roller and lay it off smooth with a 3" or 4" brush. Remove contamination if you have the time to do so otherwise it can be removed when the flowcoat is set hard by de-nibbing it with sand paper or a flat blade. Do not allow the flowcoat to get wet until cured.
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