A kit for forming a multi-component coating formulation for application using a hand-held spraying apparatus to produce a finished coating on a surface comprises a first and a second container holding respective first and second components of a multi-component coating formulation. The kit also includes at least one dispenser in the form a generally tubular body member having a closure at both a first and a second end thereof. The dispenser holds a predetermined volume of a polymerization catalyst solution having “w” weight percent of catalyst therein. The dispenser has a predetermined cross sectional area “a” given by the relationship: a≅P·A·[W/w]·10−6, where “A” is the cross sectional area of the reservoir holding a liquid coating formulation having “W” weight percent of solids; and P is the ratio by weight of the catalyst to the solids desired in the finished coating, in parts per million.