Hi Charles, before commencing the application, the important step is surface preparation, you need to fill any holes and voids before applying the membrane over, they should be flush and level with the wall, refer to the opening scenes where the joints were filled and scrapped for a flat even surface. Hope this helps and thanks for watching! :)

Hi Ben, thanks for watching and reaching out! There's 2 options! Option 1 is a liquid system, you can use liquid membranes where the crucial step is the primer, we recommend using: Gripset OP Primer: gripset.com//products/gripset-op/ Option 2 is to use the sheet membrane, we recommend the BRW HD system that will adhere directly to the PVC without any primer: BRW-HD: gripset.com//products/gripset-brw-hd/ Hope this helps and happy waterproofing! :)