Surfboard resin does indeed harden through a
chemical reaction. Usually the process
involves mixing together two chemicals, one is
made up of long molecules calledpolymersand
the other is a cross linker made up of
molecules which bond easily to the polymers.
When you mix the two chemicals, the polymers
tangle and the cross linker secures the polymer in
these tangles. The end result is a material that
is very hard because a lot of force is required
to break all the tangles.
Putting the resin in the sun can speed up
the reaction because the extra heat from the sun
makes it easier for the cross linker to form bonds
with the polymers. Also, there are UV catalysts
which use ultraviolet light (the same light that
gives you a tan) to create molecules which make it
easier for the cross linker to form connections.
Thanks for your question!
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