Amine; 4,4 '- bis sec butylamino diphenylmethane mdba can be applied to hard bubbles, soft bubbles, coatings, adhesives, sealants, elastomers, and typically make the dosage of 1-5% of polyols. 4,4 '- bis sec butylamino diphenylmethane mdba can also be used for spraying polyurea and a variety of metals and mixtures