Making filler today. I usually make just two gallons at a time. Any more than that is a pain. By the time I get all the ingredients together , mix and cleanup, sometimes I think I may go back to buying it already made.
Yes pretty much, I believe it is. I've been using it for years and I've never had any trouble with it. I like to add the mineral spirits last. This way I can make it as thick or thin as I want.