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The amount of paint needed to cover a two-car garage floor depends on the surface area and the product's coverage rate. On average, a standard two-car garage floor measures 400 to 500 square feet. Coverage ranges from 100 to 200 square feet per gallon for epoxy paint, depending on the product and application method. After some quick math, you may need 2 to 5 gallons of epoxy paint with two coats to cover a two-car garage floor. 

It’s usually a good idea to use a metal primer before painting a metal garage door, and, even if you do, you’ll need a paint that’s specifically designed to coat metal for the best results. Metal primer helps create a good surface for the paint to stick to your metal garage door, and it will help prevent bubbling, chipping, and peeling after it dries. It’s a bit more expensive to prime your door before painting, but it’s usually worthwhile, as the paint will last longer.

Sliding garage doors aren’t popular because when they can be inconvenient—they require you to leave your car—if they’re manual. But, if they’re automatic, they’re much more expensive than a conventional tilting door. Some find the sliding door less aesthetically pleasing than a tilting or barn door. 

If you have a gap under your garage door, it may be caused by an uneven garage floor. Repairing the concrete under the floor may level out the surface enough to fix gaps. You can also replace the garage door weather stripping or adjust the closing position of the door to see if that remedies your issue. Otherwise, call a garage door repair specialist to inspect the door.