Thin out the paint for color match
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I'm guessing this is auto paint. The best rule is to use a reducer of same brand some are not compatible with other brands. e.g.(PPG paint PPG reducer & activator). You will most likely have issues if you mix and match brands. And yes urethane reducer can be used with urethane paint.
its a solvent
Thinner--specifically, mineral spirits. Reducer is used in urethane car paint.
A mixing ratio given as 4:2:1 normally means 4 parts of base product, 2 parts thinner/reducer, and 1 part hardener.However, some paint manufactures add hardener second, and thinner/reducer last.
Talk to the people at the paint store for better advise but choose a reducer that matches your paint and temperature range and I go with a 2 to 1 reducer to paint ratio using a 50psi regulator, that works well enough for me.