What is the best way to roll the clear topcoat?

Most installers use an 18-inch no lint roller for topcoats, some use squeegees. The end result should be a uniform film that is rolled out evenly. If the garage is broken up into 4 sections by control or expansion joints then you will want to do one square at a time and move on to the next one when the first square is finished off evenly. A good method to start with is to pour 2 bands of material in the section splitting the square into 3 rectangles. This will create a railroad track pattern. If using Polyurea or 5400 Waterbased Urethane then you will want to keep the material in the bucket and only use it as you need it. If it is CRU or epoxy then you will want to pour it all out of the bucket onto the floor so it stays open longer. Now that you have the railroad tracks, you will begin to spread the material across the tracks going in the same direction as railroad ties. Work the material evenly while working quickly. There is no need to slow roll, you also can overlap the expansion joints so just be sure to work fast. To finish off the square you will want to cross-roll the section in the same direction as the railroad tracks. Pay attention to the sound of the roller if using one, it will sound louder where the material is thin and quieter where it is thick. Be sure the section looks good before proceeding to the next section.You will not want to touch up a section much more than 5 or 10 minutes after finishing it because the material may not flow and level out which may make the touch up noticeable. Finish all sections in this manner and you will have a beautiful floor. You may want to finish the sections leading to the home entrance first since the material will be loose and easy to work with and the entrance is what your customer will be looking at everyday. For garages that have no expansion joints you should start at the right or left side and work from the back to the front and cross-roll the completed area after you have completed about 5-7 feet. You do not want to do much more than 5-7 feet because it is important to maintain a wet edge if you do not want to see any roller marks. Another tip is to cut in the curb walls first and to also use a sausage roller for edges.