One of the first questions you have when mixing paint for application is whether it is compatible with other paints for modifying colors or other reasons.
For the most part products of the same paint type are mixable however you should always do testing before you rely on a paint for yourself or your customer and because it is so easy to shoot an email to a manufacturer you should probably contact them before you become a mad scientist.
In this case we are considering mixing a urethane base or single stage paint with a Urethane Clear.
The …