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Is it hard and sticky, or is the mesh still really soft and the resin is wet?
If the fibreglass mesh has hardened but is still sticky/tacky, a hair dryer, or a light bulb will speed it up.
If its still wet to the point you can pull it off, i'd say something is wrong with the chemicals. Never had a prob with the chemcals myself but who knows. I have had repairs that have taken quite a while to harden. You can always cut a small piece of mesh, soak it in the resin and over add some hardener and leave it on the bench to see if its a prob with the chemicals.
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