Try looking up the names Moglice and JBWeld. Both are available in large quantities, and both are used for casting stable parts. Not sure about their use as a base, but they definitely can be used to make nuts, etc.
I think their site names are the following, but I haven't checked.
Why use expensive polymers for a base, though? Why not good old fashioned concrete, or similar? Do they have properties that are, in some way, more desirable than concrete?
-- Chuck Knight