Patent ID: 7201289

Claim:
A method for introducing a polymerization catalyst into a liquid coating formulation as the liquid coating formulation flows through an outlet of a reservoir into a flow channel extending through a housing of a spray apparatus for applying a liquid coating formulation to a surface to produce a finished coating, the method comprising the steps of: a) charging into a reservoir a predetermined amount of a liquid coating formulation to a predetermined level within the reservoir; b) opening a first end of a sealed tubular dispenser holding a predetermined volume of a polymerization catalyst solution therein; c) inserting the open first end of the dispenser into the reservoir and positioning the open first end of tubular dispenser near the outlet of the reservoir; and d) with the first end of the dispenser open and so positioned in the reservoir, opening the second end of the dispenser to atmosphere, such that, in use, the liquid head of the liquid coating formulation in the reservoir prevents flow of the catalyst solution from the dispenser until the liquid coating formulation flows from the reservoir into the flow channel, whereby the catalyst solution mixes with the coating formulation in a way that a predetermined concentration of the catalyst solution is maintained as the liquid coating formulation flows from the reservoir.