Cured foam cannot be removed with solvents. The foam will eventually wear away. When using one-component urethane from a can, always dispense the foam with the can upside down. Otherwise the propellant will escape, making the can unusable. Additional precautions should be taken when applying two-component foams.
Fumes given off by the chemical reaction necessitate good ventilation within the work area.
If a great deal of foam is being used, it may be necessary to wear masks and to provide a separate fresh-air supply during installation. In cold weather, if using two-component foam in unheated areas, ensure that the chemicals are kept warm. With kits, they can be kept in an insulated box heated by a light bulb. Bulk foams specially formulated for use in cold weather are also available. Be very careful about overspraying two-component urethane, because it sticks to everything.