When one brand is used on top of another you may cause the finish to lift, orange peel, or dry slowly. By using one source you eliminate the possible incompatibility of coatings and get the support you need if any problems do occur. Try to find a source with a competent sales or technical person that is experienced not just with selling finishes, but also with spraying them. If in doubt of their capabilities, ask for references from other customers. Know which solvents to use with each step in your finish system.
Solvents make up the major portion of most coatings.
They affect dry times, flow out, and inner-coat adhesion. Using the correct solvent for each finish step is essential to the thinning, spraying and cleaning of a finish. If you are using one source for supplies, you can ask the company's technical representative which is the best solvent for each product. The wrong solvent can gum up your guns, lift your finish, or slow the drying. Measure the viscosity.