"To the amateur user - don't even try to brush or roll this product; it dries WAY TOO FAST and will leave bad roller and brush marks. I highly recommend airless or HVLP spraying for a smooth finish. For HVLP spray applications, I've had excellent results thinning with mineral spirits and conditioning using Penetrol.
Overall, this is an excellent primer if applied correctly. It sands well and provides an excellent base for an oil-based topcoat of your choice. I mainly use this primer for trim, doors, and any other interior wood painting."