about mixing mastic
hi - i'm doing a kitchen backsplash for my sister. it's a bunch of skinny-wee random tiles, mixed glass and stone (marble, travartine, and who knows what else) in various shades from cream through black coffee. looks lovely.
NEVER use it if you haven't already - it's a total pita.
anyway, the store said i have to use mastic but not the kind in the bucket bec it would stain the marble. i bought a bag of white powdered mastic.
thing is, the instructions are only for mixing the entire 25lb bag which i certainly don't need. i've been eyeballing it and the stuff seems to be operating as per spec, but i was wondering: i add powder until it's the consistency of cream cheese spread that still a little cool from the fridge. the instructions say to mix for 5min (with a power tool but i'm using the handle from a wooden spoon), rest 10min, then mix another 2min. i'm going to have *great* upper body development from this.
i'm mixing small batches (about 2 cup measure) at a time, as the bag is pretty emphatic about not mixing up more than you can use pretty quickly.
it starts off fairly thick - a big blob just hangs out in mid-air as if cantilevered - but after i've mixed it for 5min, it changes - it becomes "floopy", kinda. more like a very thick whipped cream. it still hangs onto the spoon but it droops when it didn't before (it doesn't actually fall off, though).
is it supposed to be like this? i can't find anything on the next and while i have proceeded with the job (not wanting to live here the rest of my natural life), i'm just curious.