SOLVENT-BASED CEMENT MORTAR

The question was as the solvent-based cement primer finished the solvent-based flat cement paint on alternate days, and then appeared the cracked phenomenon
The ways of solution have tree as follows:
1.The primer reduced gloss to equal to finish or more lower.
2.The finish increased gloss to equal to primer or more higher.
3.To abrade the surface of primer coat before finishing.