Paint can sometimes appear to separate whilst being applied, with small craters appearing on the surface.
Cissing is caused by surface contamination. Wax, grease or even just poorly prepared surfaces will prevent paint adhering to the surface.
To ensure that Cissing doesn’t continue, the surface must be free from contamination. Rub down the surface using a suitable abrasive paper, before using white spirit to deegrease and clean the surface area before re coating.
To help avoid any further issues, you should also thoroughly clean any application tools to ensure that all contamination has been removed.