Make sure it's been thoroughly washed, and pre-soaked it a little while before you put it in the selenium. Just don't leave your negatives in there too long, or go do something else and forget they're there (for example). Probably the easiest and best intensifier I've used.

(I've tried this with FP4+ and APX 100 with good results, from negatives originally developed in both D-76 and pyrocatechin).