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Why does the tooling gelcoat pull away from my plug?

April 26, 2017away gelcoat PLUG pull tooling

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Why does the tooling gelcoat pull away from my plug?

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Catalysation of tooling gelcoat is critical. Do not use more than 2.4% in the tooling gelcoat as more can cause excessive shrinkage. Do NOT allow tooling gelcoat to cure completely as it can shrink and pull away. This means you should never leave tooling gelcoat over night or over a weekend without laminating first. Never reduce tooling gelcoat with anything.