painting over rubberized substrate will remain sticky. sometmes it does dry depending how much % rubber is in the substrate. the paint ( krylon ) and the substrate is not compatible but there is something you can do to avoid this problem. there are few more steps to make it work. you need to apply a bond coat first ( use a paint the is 100 % acrylic for best adhesion (eg exterior household paint) and let it cure under the sun for few hours.) apply a sealer ( eg alkyd / oil spray can from the paint stores.) this will prevent the krylon paint from reacting to the bond coat. apply the sealer with thin and few coats. let it dry and you can do and finish your project.
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