I purchased the AR350 in a 5 gal and 1 gal amount to seal my 30x50 (1500 sq. ft.) Shop floor. I really only needed 5 gal. However, the spare 1 gal will be put to use on another project. This product was a breeze to use. Just a new clean paint roller on an extension, a new clean paint pan and start rolling. The floor came out nice. A clean stain finish with just ONE APPLICATION. By accident I spilled 5 gal. Of water after only 6 hours of cure and that water needed up. Impressive. I just used a commercial squeegee to push it out the shop door. I would reccomend this product for sure..