Since it's already cured way beyond the green phase, I'd make sure to rough it up good before putting the next layer of epoxy on. Shouldn't matter that it's a different brand, as you'll be going for a mechanical bond rather than chemical as when the base epoxy were still semi-cured.

Brian

: has anyone changed epoxy on a project ? i need to put one more coat
: on the hull of a kayak.
: i have been using mas. it's been curing for about a week. i want to
: go over it with west systems
: 207. i don't want to go buy more mas right now so i'm wondering if
: it's ok to put the 207 over
: the mas ?