Guidance by Scenic City Garage Coatings. Reviewed October 6, 2026. Planning information; onsite suitability is confirmed by the contractor.
Identify what is already on the concrete
Look for an old invoice, leftover labeled container or installation record. “Epoxy” is often used casually for several finishes, so tell the contractor if the chemistry is unknown. A clear sealer, a one-part floor paint and a multilayer resin system need different conversations.
Photograph the floor under daylight and garage lighting, especially tire paths, repaired spots and the doorway. Note waxes, cleaning products, oil spills or silicone-containing products used in the space. This history helps define the investigation without pretending a photo can confirm compatibility.
Ask for three separate decisions
1. Is the old coating adequately bonded?
The contractor should explain the adhesion assessment and where it was performed. The visible center of the floor may differ from the door edge or a prior patch. Ask how representative areas will be checked and what finding would trigger removal.
2. Is the new system compatible?
Ask for written manufacturer guidance covering the proposed use over that existing material. Compatibility is more specific than choosing the same color or another product labeled epoxy. If the old chemistry is unknown, the quote should make that uncertainty explicit.
3. How will the surface be prepared?
Request the cleaning, abrasion and transition treatment in the scope. A surface can look clean while retaining contaminants or a glossy layer that needs preparation. Our mechanical preparation guide explains why the required profile belongs to the chosen system.
A product instruction is not a rule for every floor
Rust-Oleum’s EPOXYSHIELD instructions describe an adhesion check for previously coated floors and different treatment for well-bonded versus poorly adhering paint. That illustrates the need to follow the selected product’s instructions; it does not certify an existing floor for another coating system.
A recoat interval is also product-specific. Sika’s Sikafloor-510 LPL data publishes a waiting and recoat interval under stated conditions. A floor installed years ago is not automatically inside a fresh-coat interval. Ask how an aged finish will be prepared rather than using a new-installation timing table as permission to coat over it.
Compare retention and removal as separate scopes
| Retain and recoat proposal | Remove and rebuild proposal |
|---|---|
| Identifies the old system and the evidence for its bond | Defines the extent of removal |
| Names the compatible new layer and preparation | Defines concrete preparation and repairs after exposure |
| Explains what happens if weak areas appear | Explains allowances for hidden contamination or damage |
| States remaining appearance limitations | States the new system layers and finish |
Ask each contractor to price the actual floor condition. A cheaper recoat proposal may depend on keeping material another assessor believes must be removed. That is a scope difference before it is a price difference.
What if the existing coating is already peeling?
Start with our peeling floor repair decision guide. A top layer is not a substitute for evaluating the failure underneath it. Avoid selecting a new finish until the proposal explains the bond, moisture and removal decisions.
For your request, include the old product if known, whether any layer lifts, approximate dimensions and your city. Request a garage coating conversation or call 317-509-9873. Final suitability belongs in the contractor’s assessment and written proposal.
