Oil can migrate into porous concrete. A surface cleaner may improve appearance without proving the slab is ready for a coating bond. The scope should explain how contamination will be evaluated and treated.
Why this detail changes the project
Old oil staining is not automatically a deal-breaker, but it changes the inspection and preparation conversation. A good coating conversation turns the visible condition of the floor into a defined scope, rather than hiding it behind a single product label.
Use this at the estimate
- Take a few photos in natural light, including edges, cracks, stains, drains, and existing paint.
- Describe how the garage is used and when vehicles or storage need to return.
- Ask the provider to state the preparation, repair assumptions, system layers, and timing in writing.
Related reading
Continue with the garage coating quote checklist, moisture guide, and garage coating service guide.
Show stain locations during the estimate and avoid applying a DIY sealer or paint over them before the inspection. That can hide the problem while making preparation harder.
Oil can migrate into porous concrete. A surface cleaner may improve appearance without proving the slab is ready for a coating bond. The scope should explain how contamination will be evaluated and treated. The product data and the actual slab condition should control the final recommendation, so request that explanation in the written proposal.
Can oil stains be coated over?
Oil can migrate into porous concrete. A surface cleaner may improve appearance without proving the slab is ready for a coating bond. The scope should explain how contamination will be evaluated and treated. The product data and the actual slab condition should control the final recommendation, so request that explanation in the written proposal.
Should I use a degreaser before the estimate?
Oil can migrate into porous concrete. A surface cleaner may improve appearance without proving the slab is ready for a coating bond. The scope should explain how contamination will be evaluated and treated. The product data and the actual slab condition should control the final recommendation, so request that explanation in the written proposal.