Why do i have dimples on my cured surface?

Epoxy was exposed to contamination. Dimple causing contaminates are; Uncured silicone. uncured oil-based products, wax, and oils. Other contaminates are Dust, powered gloves, WD40 and tack rag. Contaminated Epoxy must be stripped down and removed from the surface before another layer of Epoxy can be applied.