Ronseal Quick Drying and Expanding Foam Filler is ideal for filling large and awkward size gaps & cavities on interior and exterior surfaces The quick drying formula can be used on wood metal glass or masonry yielding up to 25 times its initial volume to fill any size repair The simple to use trigger applicator ensures smooth consistent filling of the hole minimising any overfill whilst the advanced liquid foam can be used to provide insulation against heat sound and moisture Quick drying - dries in 1 hour Fills large holes - foam expands to 25 times its size Will not shrink or crack Easy to cut or sand Can be overpainted For interior and exterior use