To work with Epoxy Resin, one needs an oven for the lamination process to be carried out at temperatures under 25º C (77 F) because the molecules do not aggregate properly, thus causing the surfboard to be fragile, rubbery and soft, being too flexible for surfing.
The curing process is too slow and has low productivity, taking 7 to 10 days to complete all the processes. The finish is damaged because the resin is opaque, milky and dim. It is rubbery, thus rendering the sanding process difficult.
The Epoxy Resin and the hardener are divided into pieces that cannot be changed, differently from the Polyester resin, which can be changed to compensate the low temperature.
At low temperatures, the curing process is slow, generating the decantation of the Epoxy resin, which results in micropores and, as a consequence, in infiltrations.
The lamination process usually occurs at closed environments, being damaged when the room is heated because there is discharge of the humidity that was deposited during the night. In the presence of high relative humidity, there is no correct fusion between the different lamination layers.
FROM THE KEAHANA WEBSITE
I don’t have an oven so can I use epoxy to laminate my board?