Paint manufacturers have recognized these problems and have come to the rescue with new solutions. But a word of advice: If your garage floor sees heavy water leakage, if it's badly cracked or if it's damp and slimy all summer, don't apply any coating. In those cases, you're better off simply keeping it as clean as you can and then calling it quits. 

One of the best ways to have a garage space that increases your home value is to make sure it is in good repair. When a potential buyer does their very first walk through your garage can help make or break the sale. If it hasn’t been touched in 20 years the time to spruce it up is before the first buyer comes to look. When thinking about a garage that is in good repair think about things such as;
I stink at drawing. So pencil and paper isn’t an option for me when working to design my perfect garage (which I’ll unveil at some point in the future). Instead, I’ve been using SketchUp Make —a free 3D modeling software program, once owned by Google, that’s been around for almost 20 years now. And while CAD-style programs can be quite intimidating, SketchUp is super-easy to use and has a huge active community made up of all kinds of people—from architects and interior designers to woodworkers and other creators.
Garage floor coatings fail for a number of reasons. First, the floor is usually not clean enough to receive a coating. Years of grime have to be removed using solvents and proprietary cleaners. These are sold at paint stores, hardware stores, home centers and industrial supply houses. If the floor is really filthy, consider pressure washing. Rent a machine that produces at least 1,200 to 2,000 psi. Also, buy some grease-cutting detergent at the rental store. Along similar lines, you might consider a steam cleaner if a pressure washer is unavailable.
Flooring: Concrete slabs are cold, hard, and not very pretty to the eyes. Even if you’re on a tight budget, installing new floors during your garage conversion could be worth your while in terms of comfort and aesthetics. Vinyl flooring is one of the more cost-effective options and is available in many different designs made to look like wood, tile, or natural stone. If the space is framed in and moisture isn’t a concern, carpet is also a viable option for softer flooring as long as insulation occurs beforehand.
Leaky doors and windows let in uncomfortable drafts and increase heating and cooling costs. Check your garage service door to be sure it has good weather stripping and a threshold that seals tightly to the bottom of the door. In most cases, if your service door is missing a threshold and weather stripping, it’s more efficient to replace the door with a new, weather-tight version. You can buy an inexpensive prehung metal exterior door at home centers and lumberyards.
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