I drilled small holes and sanded it rough the holes didnt go all the way through. I doubt you really have to do this as the Ti Devcon and the screws should be enough to prohibit base movement and separation of the devcon.
I havent had any problems with it and the gun has about 1200 rnds through it so far and the zero stays the same. http://www.devcon.com/devconfamilyproduct.cfm?familyid=124
this is what I used and I also use it to bed my rifles. It is hard as heck when cured and had to work with too but it is pliable enough to withstand shock and torsional forces. It also works good for adding weight where needed. It machines well too and you can tap it although I would suggest inserting a helio-coil and this would be for low strength usage as I have not tested it for strength with tapped holes.