FAQs about Water-based Epoxy Colored Sand Floor Paint: 4 Major Problems, Targeted Solutions to Avoid Pitfalls

Issue 1: Surface Wrinkles and Bubbles After Application

 Cause Analysis: ① The base layer moisture content exceeds the standard (>8%), causing evaporation and bubbles after application; ② The colored sand and curing agent are not mixed evenly, resulting in trapped air; ③ The application temperature is too low (<10°C), resulting in a slow curing process and wrinkling.

 Solution:

 Small Area (<10cm²): After the floor is fully cured (7 days), use a utility knife to open the bubbles and remove any impurities. Fill the gaps with a water-based epoxy repair agent and the same colored sand. After drying, sand the surface smooth and apply a topcoat.

 Large Area: If the area with bubbles or wrinkles exceeds 10% of the total surface area, remove the floor, reapply two coats of moisture-proof primer to the base layer, and then apply the standard process.

 Issue 2: Color variation after curing, with areas showing varying shades.

 Cause Analysis: ① Mixing different batches of colored sand during construction (natural colored sand has slight color variations between batches); ② Uneven application of topcoat, resulting in darker areas with thicker coating; ③ Significant color variation in the base layer (e.g., areas previously painted), causing color variation due to color bleed-through.

 Solution:

 Minor color variation (not noticeable to the naked eye): Apply a coat of epoxy wax to the entire surface, using the wax's covering power to minimize the color variation.

 Significant color variation: For lighter areas, apply a thin coat of diluted topcoat of the same color (diluted with water in a 1:1 ratio, applied thinly). After drying, compare the colors until they are consistent with the surrounding areas.

 Issue 3: Delamination at edges or corners after six months of use.

 Cause Analysis: ① Edges, such as corners and doorways, were not reinforced, resulting in delamination from prolonged foot traffic and friction; ② Primer was not applied to the edges during construction, resulting in poor adhesion; ③ Ground subsidence caused cracks in the base layer, leading to delamination.

Solution:

Local delamination (small area): Scrape off the delamination, sand the base, and apply a coat of primer. Fill the gap with water-based epoxy putty and sand of the same color. After drying, apply a topcoat. Mask the edges with masking tape to ensure a clean line.

 Delamination caused by cracked base: First, repair the cracks in the base (using cement mortar). After drying, repair the floor according to the above steps.

 Issue 4: Colored sand particles have fallen off, leaving "pits" on the surface.

 Cause Analysis: ① The purchased colored sand has poor compatibility with the resin (low-quality colored sand has an uneven surface, making it difficult to bond with the resin); ② The ratio of colored sand to curing agent was incorrect during application (too little curing agent, so the resin was not fully cured); ③ Prolonged friction with sharp objects caused particles to fall off.

Solution:

Small pits: Use a toothpick to apply a small amount of water-based epoxy glue and fine sand of the same color to fill the pit. After drying, sandpaper to smooth the gap.​

Large areas of loose particles: Partially scrape away and then reapply the middle layer of colored sand. Choose colored sand from the same brand and batch as the original product to avoid compatibility issues.