Flooding is commonly experienced with all paint markers; it occurs when the nib is over-depressed, releasing too much paint for the nib to absorb. This results in paint collecting in the nib housing which, once filled to capacity, will over-flow around the nib.  Until the housing is cleared, paint will continue to flow out of the marker housing.  To clear, simply wipe off any excess paint and the paint marker will be fine to use again. Note: do not depress the nib again.