Looking for tips on using Kalk paste to kill encrusting Montis

[gregzz4]

I have what I thought was a beautiful specimen, but in may tank all the thing does is encrust. The frag I bought years ago was nice and thick, so this lead me to believe it would plate. Not a chance. I've tried it in multiple spots in my tank and all I'm left with now is monti all over my LR.
I can't remove the LR as there's too much good stuff on it.

I don't want to try the epoxy method as there's just too much to cover, so I'm going to attempt to kill it with Kalk Paste.

Any tips/suggestions ?

Really crappy pic of what I'm dealing with