I am purchasing Bruce Natural Choice (Natural Reflections depending on the retailer). It is 5/16" hardwood and best matches the hardwood in my house now (from 1940) both in color and width. This is replacing carpet in the den and tile in the kitchen. The slab looks pretty rough. Lots of patches (pictured). The kitchen still has thinset on the slab from the tile. I plan to clean it up with a hammer drill chisel. The plan is to glue it down. Instructions say to use "Armstrong EverLAST Premium Urethane Adhesive". I've read this product may have cupping problems with moisture. Instructions say to use Armstrong VapArrest S-135 or "an inexpensive sheet vinyl or “slip-sheet” (felt-backed with vinyl wear layer)" as a vapor barrier. Armstrong VapArrest S-135 doesn't seem to be for sale anymore. Any other recommendations? Plan is: 1. Remove thinset. 2. Apply vapor barrier. 3. Use Armstrong EverLAST Premium Urethane Adhesive with 1/4″ x 1/2″ x 3/16″ V-Notch trowel per instructions. 4. Lay down hardwood.