specifications. If your vehicle was originally charged with R12 refrigerant, for example, the oil type specified, 'mineral', will not apply. Additionally, General Motors issues Bulletin # 02-01-39-004B replacing PAG 150 oil with a lower viscocity oil.
The term square in reference to roofing materials refers to 100 square feet of roof area. One square of slate is the amount of slate that it takes to cover 100 square feet of roof area. A 10 foot x 10 foot section of roof would equal one square. So would a 4 foot x 25 foot section. Ditto for a 5 foot x 20 foot.
Unless you have a lot of cracks that will eat it up (and I mean a lot!), you will get at LEAST 50 sq ft per gallon, and probably more (250 sq ft+ per bucket). Someone wrote in their review they got close to 60 (almost 300 sq ft for a 5 gal bucket on a fairly solid roofing material).