by Mike - Alumilite » Tue Jan 20, 2015 10:37 am
When you mixed the catalyst in with the HS2, it typically gets more pink in color. The dye is very faint when in the catalyst itself but as soon as mixed with the base, shows up more.
And yes, you can use the HS2 or HS3 catalyst ... you may see a slightly faster/slower cure time and a few point hardness difference but should be minimal.
Mike