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Hi Turk,
Yes, 5g equates to 2% of 250g. There is a degree of adjustability though, if you find it cures too quickly or you simply need more working time, you can lower the catalyst ratio slightly. 21'C is about the normal ambient condition quoted on most datasheets but its certainly warmer than over here in the UK at the moment - the warmer the temperature you work in, the faster the primer (or resin/gelcoat/etc.) will cure so with anything polyester (or vinylester) based gives you the added benefit of being able to adjust the catalyst amount to account for the temperature.
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