Hey all

I currently use MDF as a spoilboard on my 1200x1200. Problem i am having is i have to skim almost every time i use it due to the weather etc - i assume. Anyway - this is getting a bit perplexing as i can't do a "quick" job because i never know how even the bed is.

Has anyone used polyurethane sheet as a spoil board - NOTE: i don't use a vacuum system.

Any feedback would be great - other ideas etc. Also if you have used sometghing other than wood what have you used for hold down?