The finish depends on what is underneath.
A dry-looking floor is only the beginning of the assessment.
Discuss water and slab conditions
Describe water entering at the door, stains near walls, peeling coatings, and any history of flooding. An installer should determine what testing and assessment the proposed system requires. A decorative coating should not be assumed to fix drainage, an active leak, or structural movement.
Ask for system-specific testing
Different coating products have different application limits. Ask how substrate moisture and environmental conditions will be assessed and recorded against the manufacturer requirements. A simple visual inspection cannot establish every condition inside a slab.
Make preparation part of the proposal
Ask which existing materials will be removed, how contaminants are treated, what mechanical preparation is planned, and how repairs and joints are handled. Confirm dust controls, cleanup, and any protection required for the rest of the garage.
Know when to pause
If the cause of failure, water entry, or movement remains unresolved, ask for further assessment before choosing a finish. A manufacturer-compatible moisture treatment may be part of some specifications; it should be selected for the actual condition rather than added as a blanket promise.
Technical background: Sherwin-Williams on resinous floor preparation and Sika product guidance for a polyaspartic finish. These links are background, not a product endorsement or an installation specification.
Tell us about your floor.
Start with the size, the condition, and the way you want to use the space.