No Nonsense Expanding Foam comes in a large 750ml value for money size to ensure you have enough product for an average house sealing exercise.
Simply attach the nozzle and spray the foam into holes that you suspect pests may be using to access your building. No need to use too much, as the foam will expand to double its size whilst drying. The next day, when thoroughly dry, trim off any excess foam to leave a neat and tidy finished job. Follow the instruction on the can. Wear the gloves provided because this is a very sticky product. Where holes are of sufficient size it is a good idea to first block them with wire mesh. Then spray over and into the mesh with the foam. This creates a far more rodent proof barrier.