Make sure to check the manufacturer's guidelines for application. Each GRP differs and will require you to apply according to its guidelines for correct application and to comply with any guarantee the manufacturer offers.
Cure It offers a dedicated Extra Cold Resin and Topcoat for temperatures between 0 -12 degrees. Res-Tec for Flexitec 2020 offers a Primer and Resin Accelerator for temperatures between 1-5 degrees. You can purchase these products from JJ Roofing Supplies in-store and online by clicking here.