I have been using a product called BuildTak with great success for PLA. I have not tried it yet for ABS. The first sheet has lasted for many prints and the only issue so far is that if there is a large flat bottom surface, it can be a challenge to get the print off, so far though I have been successful using a putty knife and patience. Most parts release with no problem. Not once have I had a warp problem or premature release on small parts since I started using it.