I don't think it matters whether you put a cotton cover or silver on top, next to the iron.
All personal preference .... some will swear either ways is the best!
I'm not even certain myself. The last time I changed things up, I put the silver stuff (sorry, don't know what they call it!) as I was convinced by the LQS that it was the answer.
I use a lot of Best Press too .... either ways, the fabrics need to be changed up and washed with the excess Best Press.
For the silver (again because of the LQS) I had stapled mine onto my big board ... it eventually got coated, and I scrubbed it down and it seemed to be fine. I have quite a build up again, and need to go at it and scrub. Not sure how well it will clean off this time?
I'd be happy to hear comments from others re Best Press and the silver.
Please? and Thanks!