Touch N Seal Two Component Class I Fire Retardant Foam Kits are portable, self contained dispensing systems that, when used according to manufacturer’s directions, supply Class I fire retardant, thermal insulating and sound attenuating 2- component polyurethane spray foam. Touch N Seal spray foam is permanent and dries within minutes of application. The U2-600 kit yields 600 board feet or 600 square feet using a 1″ layer.