David is correct in that the build platform will get scratched over time and will not negatively effect adherence. A rough surface can actually be advantageous for parts gripping the aluminum plate.
If you are having big issues with parts sticking, the build platform could be sitting a little too high above the silicone, but you can drop the build platform slightly to resolve the problem.
We have a writeup on how to use the Fine Tuning tools in Preform here: support.formlabs.com/entries/40866853
Hope this helps!