No wax or other barrier is needed for epoxy to cure.
Some epoxies under some conditions will, in curing, exude a water-soluble
coating called 'amine blush' which needs to be washed off before re-coating
or painting.
Sanding is a good idea before recoating or painting.
UV will degrade epoxy over time. I think that cocering with tape will be
adequate protection.


"(PeteCresswell)" wrote in message
...
Seems like with polyester resin, one needs to mix some wax with the final
coat
so air cannot get to the laminating coats and they will harden fully.

Does the same thing hold with epoxy? If not a finish coat, is a layer of
paint
needed to make it harden fully?

My agenda is I'm covering a seam. I could finish-coat it if such a thing
is
available using epoxy... but I don't want to paint it because I want the
option
of easily checking what's going on underneath.

If UV degradation is an issue, my intent would be to cover the area with
wide
electrical tape - or some other tape that is easily removed/replaced.
--
PeteCresswell