How to Use a Foam Gun

5. Use the tool to complete the necessary tasks. When bonding structures, apply the foam in a zigzag pattern, either from bottom to top or from right to left / left to right. When filling gaps with foam, move the gun from bottom to top, and fill no more than 80% of the space, as the foam expands as it dries and will occupy the remaining area.

Allow the foam to dry according to the instructions. This usually takes anywhere from two hours to a full day.