Ready Steady Eddy

[EddyCurrent]

I had those thoughts myself but decided to epoxy onto bare metal. I had put metal primer on the box section beam but before putting the moat on I sandpapered it off the top. My intention is to fit the linear rail and paint over everything up to that.
Also sod's law, my glasses fell to bits as I was getting set to pour, the frame had broken letting a lense drop to the floor, had to quickly superglue it all back together.

I know this is somewhat less than scientific but I just had a play with the sample epoxy pour I did 3 days ago, a scriber barely scratched the surface and a centre punch made no more of a mark in it than it did in the steel box section. Overall I'd say that stuff was rock hard.