It’s attached but isn’t insulated worth a damn. That’s probably my next project. That’s a good call about oil vs water based. What I’m probably going to use is oil based. I have an electric heater I’ve been running out there when I’ve been working on it but I don’t know that it raises the temp all that much.What temp does your garage run ? If it’s insulated or attached you could run a propane heater. The colder it is the longer it takes to dry. You can do oil based in colder temps I just wouldn’t do water based under 50.