Blistering and peeling of epoxy flooring are common quality issues during construction. As a professional floor paint manufacturer, we provide an in-depth analysis of how temperature and humidity control, substrate treatment, and material ratios affect the lifespan of flooring, helping you avoid rework risks and deliver flawless projects. Epoxy floor paint is widely used for its aesthetic appeal, wear resistance, and dust-proof properties, but many users report that floors start blistering or even peeling off in sheets shortly after application. This not only makes repairs difficult but also disrupts production. As a floor paint manufacturer, we have summarized the five key factors leading to blistering and peeling, helping you “avoid pitfalls” before construction.
1. **Excessive Substrate Moisture Content (Most Common Cause of Blistering)**
A cement floor may look dry, but that doesn’t mean it is.
**Risk:** If the moisture content exceeds 8%, the sealed paint film traps groundwater vapor, which expands when heated, pushing up the film and forming bubbles.
**Recommendation:** Use a moisture meter before construction, or cover the floor with plastic film for 24 hours to check for vapor.
2. **Inadequate Substrate Treatment (Leads to Large-Scale Peeling)**
Floor paint isn’t just “painting”; it must bond with the cement floor.
**Risk:** Surface dust, oil stains, or old paint layers result in poor adhesion.
**Recommendation:** Use a heavy-duty grinder for deep sanding to open the cement pores, ensuring the epoxy primer can penetrate.
3. **Ignoring Environmental Temperature and Humidity**
**Risk:** If humidity exceeds 85% during construction, the paint film may turn white, lose gloss, and interlayer adhesion will significantly decrease.
**Recommendation:** Avoid construction during rainy or extremely cold weather.
4. **Inaccurate Material Ratios (Non-Curing or Stickiness)**
**Risk:** Epoxy paint is a two-component material. Incorrect hardener ratios or uneven mixing can cause partial non-curing, weak film strength, and easy damage later.
5. **Improper Interlayer Flash-Off Time Control**
**Risk:** If the previous layer (primer, intermediate coat, topcoat) isn’t fully dry before applying the next, solvents get trapped inside, leading to “interlayer delamination” later.
**The Powerful Role and Professional Construction Process of Floor Paint**
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**Conclusion:** Flooring projects are “30% materials, 70% construction.” By choosing our high-permeability primer and high-quality topcoat, combined with a scientific construction process, you can achieve a “long-lasting, durable, blister-free” high-quality floor.