A garage-floor epoxy succeeds or fails at the concrete. Oil, curing compounds, weak laitance, moisture and an inadequate surface profile can cause peeling even when the coating was mixed correctly. Treat preparation, environmental control and batch planning as part of the coating system.
The workflow below is based on GoIndustrial’s EP100 product data and current preparation guidance. Other epoxies can require different temperatures, primers, spread rates and recoat windows, so the exact product sheet always controls.
Quick answer
Confirm the slab is sound, dry and free of moisture problems; repair defects; mechanically prepare by shot blasting, diamond grinding or suitable sanding; remove all dust; mix the full two-part kit exactly as supplied; apply within the stated pot life and spread rate; then protect the floor through the full cure.
Before you start
Inspect the slab for oil, paint, sealers, curing compounds, efflorescence, hydrostatic pressure, cracks, spalling and weak surface paste. EP100’s current data sheet recommends clean, dry, sound concrete and mechanical preparation such as shot blasting, diamond grinding or sanding. It states that washing is not recommended as the primary preparation method.
Fresh concrete should be at least 30 days old. The EP100 data sheet recommends moisture below 5 percent and a minimum application temperature of 5°C. A wet surface must dry at least seven days before coating under that product guidance. These are product-specific minimums, not a promise that every slab is ready at those numbers.
Tools and materials
- Exact two-part epoxy kit and current TDS/SDS
- Concrete moisture-test method suitable for the project
- Diamond grinder, shot blaster or approved sanding equipment
- Crack and defect repair materials compatible with the coating
- HEPA vacuum and clean dust-control tools
- Low-speed mixer and clean mixing pail
- Squeegee and lint-resistant rollers suited to the specified film
- Spiked shoes where required by the application plan
- Masking, ventilation, eye protection and compatible gloves
Step-by-step method
-
Assess the slab
Identify coatings and contamination, map cracks and joints, and investigate signs of moisture. Adhesion testing and a moisture assessment are cheaper than removing a failed floor.
-
Plan the job
Calculate area and kit coverage using the product spread rate. Divide the floor into reachable sections, plan an exit path and arrange enough people and tools to place each mixed kit within the working time.
-
Repair defects
Remove unsound concrete and repair cracks, spalls and divots with compatible materials. Treat moving joints according to the floor and coating design rather than rigidly filling every joint.
-
Mechanically profile
Shot blast, diamond grind or sand as permitted to remove weak paste and contaminants and create the profile required by the coating. Edge-grind walls, posts and doors where the main machine cannot reach.
-
Remove dust and verify
Vacuum thoroughly and inspect in strong side lighting. The slab must be sound, uniformly prepared and free of dust, oil and residue. Perform any specified adhesion or moisture confirmation before mixing.
-
Condition materials and space
Confirm air, concrete and product temperatures and consider dew point. Stop condensation, vehicle traffic, wind-blown debris and insects. Keep the conditions within the technical data sheet through application and early cure.
-
Mix the full kit
Pre-mix components if directed, then combine the supplied Part A and Part B in the exact ratio. Mix at low speed for the specified time while scraping the sides and bottom. Do not split a kit unless the manufacturer provides an accurate by-weight method.
-
Place within the working time
EP100 should be applied within 45 minutes according to its current data sheet. Pour ribbons onto the floor, distribute with the specified squeegee or roller and back-roll consistently. Avoid leaving mixed epoxy in a deep pail where heat builds quickly.
-
Protect the cure
Restrict dust, water, tires, chemicals and foot traffic for the stated schedule. EP100 lists a seven-day full cure; cooler conditions can slow reaction. Use the actual product’s recoat and service times.
When chemical preparation fits
A product such as WashAway Xtreme may be specified to chemically profile certain concrete surfaces. Its current data calls for a test area, use above 5°C, no dilution and complete rinsing of residue. That process is not a universal substitute for mechanical preparation—especially when the selected coating specifies grinding or shot blasting.
VersaGuard is a moisture-mitigation treatment for qualifying bare concrete, not an automatic primer for every epoxy floor. It requires a penetration test and controlled application without pooling. Use it only when the slab condition and complete coating system support it.
Common mistakes
- Coating over oil, sealer, curing compound or weak laitance
- Relying on an acid wash when the coating calls for mechanical profiling
- Ignoring slab moisture or condensation
- Rigidly filling active movement joints
- Splitting kits by eye
- Leaving mixed epoxy in the pail
- Applying too thickly or stretching coverage too far
- Allowing tires or water onto the floor before full cure
Safety and limits
Grinding and shot blasting create silica-containing dust and require appropriate engineering controls, respirators and training. Epoxy components can irritate or sensitize skin. Review all SDS documents, ventilate the work area, wear compatible PPE and keep people and pets away through cure.
Moisture pressure, structural cracking or widespread slab movement may require professional assessment before coating.
Frequently asked questions
Do I always need a primer?
No. Use a primer or moisture-mitigation treatment only when the selected coating system and slab condition require it. Follow the complete system data.
Can I acid-etch instead of grinding?
Not when the epoxy’s current data requires mechanical preparation. Chemical profiling can be appropriate for specific products and slabs, but residue, moisture and inconsistent profiling can cause failures.
Can I coat new concrete?
EP100 calls for concrete at least 30 days old, along with moisture and preparation requirements. Other products may differ. Age alone does not prove the slab is dry or ready.
How long before I park a vehicle?
Use the product’s service schedule. EP100 lists a seven-day full cure under its stated conditions; cold temperatures can extend cure.
Build the floor system before opening the kit
Shop garage-floor coatings and preparation products, or ask us to review your slab, area and service conditions.
Shop floor coatingsAsk our technical teamSources and further reading
- Enviro Epoxy EP100 Product Data Sheet
- InnerCrete WashAway Xtreme Product Data Sheet
- InnerCrete VersaGuard Technical Data Sheet
- GoIndustrial: EP100 Grey Epoxy
This guide provides general educational information. Products, substrates, site conditions and regulations vary. Follow the current technical data sheet, package directions and safety data sheet for every product you use. Code-regulated, structural or safety-critical work may require a qualified professional.
