I first used the solvent-based version to seal the concrete floor in my new garage. This time I ordered the water-based version to seal the concrete apron around the outside of my garage. Personally, I would recommend the water-based version, as Foundation Armor claims both versions are equal in their effectiveness, and the water-based version barely has any fumes and just seemed easier to apply. I used a backpack sprayer and the solution went on pretty evenly, and I then used a broom to finalize the application. I had a pretty large area to cover, so I did both coats one portion at a time, so the first coat did not dry before I applied the second coat. I will definitely use this product again, should the need arise.