1. When the construction tool short-haired roller is not in use, it should be soaked in the material to prevent it from contacting the air, otherwise the roller will harden and cannot be used continuously. Be sure to wash the drum thoroughly at the end of each day's work. At the same time, special attention should be paid to the shaft not to be stuck by the material, otherwise the drum will not rotate well and the construction will not be ideal.

2. Coating essentials: Try not to exert force on your hands and shoulders, hold the handle of the roller with your little finger, ring finger and middle finger, add your index finger, and press lightly with your thumb from the top to make the roller apply vertically and roll gently. Follow the principle of first up, then down, left first, then right, and corner first, then large surface. Adjust the paint content, lightly against the surface to be coated, and repeatedly dispense the paint from top to bottom, then rotate the roller straight up and down. When the rotation speed of the drum is too fast, the paint splashes too much, so move slowly.