I applied it around the edges with a paintbrush, and applied it to the top with a roller. It took me 3 hours. I wrote customer service and the president of the company responded to me, talk about good customer service! I applied it pretty thick and used 3 gallons on a 40 ft fifth wheel, so wish I didn't buy an extra gallon but I'll put another coat on in the summer. The picture with the broom is the before, I bought gray so I could ensure I didn't miss a spot. I recommend this product as it looks pretty solid. The video is 48 hours after application and the pictures are immediately after.