I ordered a gallon of Liquid Rubber last summer, and inquired if it could be spread with an adhesive applicator trowel; the sales person was not aware of this having been tried. I tried using a commercially available trowel with 4 sawtooth teeth per inch, and 0.135 inch notch depths, holding the trowel at about a 45 degree tilt. This worked great, and spread the liquid at exactly the recommended rate. The trowel is followed by a brush or roller to level the liquid.
My application is to repair the seams on an EPDM roof; the seams are weathering much faster than the roofing membrane. After wire brushing and vacuuming the areas to be repaired, the new coating is well adhered, smooth, and continuous, and, AFTER A YEAR AND A HALF THE ROOF LOOKS BRAND NEW! I just ordered two more gallons.