Can i use this on pressure treated wood? We are building a raised deck with play house for our kids. Im trying to prevent splinters. Any advice?

Yes, it's best to allow pressure treated wood a few months to weather before applying a stain. When it's weathered a bit, you can apply this Solid Stain and Sealer over it. In order to be effective, a stain must be able to adhere. Surfaces must be sound and may be dry or damp. If damp, the wood should be free of puddles and not feel wet. Be sure surface is free of all dirt, mildew stains, loose wood fibers and other foreign matter