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New putty won't stick properly to hard putty so what I would suggest if you want to add more putty reinforcement after the original reinforcement has cured would be to add a 'coupling' layer of wet epoxy. This could be any epoxy laminating resin (such as our Epoxy Coating Resin or EL-2 Laminating Resin). Apply it wet over the back of the cured putty and then pu the new layer of putty directly onto that wet resin. The extra epoxy will ensure that the new putty sticks to the cured material properly.
I hope this helps.
Matt
Matt Statham
Easy Composites / Carbon Mods - Technical Sales
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