Quote Originally Posted by Wobblycogs View Post
I'd have the sander over at 45 deg to the poured surface so that only the meniscus was touched. Pretty sure you could easily control it enough then to avoid damaging where the rails will be fitted.
That sounds like a slightly better proposition but I tend to use hand tools a lot as I find control is better, material comes off slower, by the time I've got the power tool out etc. I've got the job done, it's good exercise.