It is moister compatible corrosion resistant moisture cure 2k epoxy system, VS 70%, specific gravity 1.25.
There is no any fault in mixing ratio, apply by airless spray and tried by brush also too much sagging, not over application also cuz in first coat thsi is appears, couldn't find any reason for them?
anyone who is field expert, what can be the reason?
This is a coating problem, and most likely has nothing to do with the concrete. Sagging is usually a function of build per coat, temperature, mixing ratios for the coating and coating viscosity.
The usual fault tree analysis would start with coating thickness, then the temperature of the substrate and the air temperature, then the actual coating proportions (epoxy, hardener, thinner). If all check out, then go back to the manufacturer.
If you aren't expert enough to check this, employ a NACE Level 2 Inspector to go through your processes and application method to see what is wrong.
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