Happened to me, too, except on the same boat. Part of the epoxy applied in warmer, earlier morning had cured clear; but the part that was applied later near the evening came out white. Ooh, it clear up the next date arround noon. Every morning when the dew formed on the boat surface, it turned white again. It all cleared up after a month and now after the varnish was applied, you cannot tell what / where I have agonized for weeks.
Good luck to you.

: If it is surface blush you should be able to wash it off with soap and water
: and maybe a scotch-brite pad. If this does not work then it is probably a
: deeper blush within the resin. You may have to sand deeper to get rid of
: it.