First of all you dont need to install a surface dpm if your floor reads less than 75% relative humidity on a hygrometer flooring meter. You may choose to buy one to try and miss the costs of installing dpm when its not needed after all. If not on with the info. 1- Subfloor should be cleaned and as dry as possible. 2- Prime floor with neat p131 on non absorbent floors and water down on absorbent sand cement etc (approx 1-3 mix) 3- Next self level the floor with an acrylic levelling compound. 4- When dry (24hrs+) you can give first coat of dpm (F75) 5- Second coat of dpm (f75) when first is dry. I like to put this down when the first coat has a very slight tacky surface on it but not wet of course. Depending on temp about 12 hours or so later but within 24hrs. 6- Leave second coat for a full 24hrs to cure and then prime again with neat p131 primer. 7- Self level the floor now with leveling compound of your choice. I would use a water based product (red bag) or acrylic levelling compound You will need- Primer - P 131 neoprene primer Dpm - F75 ( you need 2 coats and cant part mix tubs) Levelling compound - acrylic for base and your choice for top finish These are basic instructions to give you an idea of what you have to do. Full instructions will be on the products and available to you where you purchase your products. You can leave a post for me if you want any more info.