Avoid the aggravation of tape and sooth your OCD with these paint caps! They work perfectly to seal off openings while refinishing your valve cover. Before painting, apply a little heat (start at 48*C/110*F) to the tops of the plugs to soften the PLA and give a gently press. I didn't get even a hint of paint creep under the caps.

Colours are may vary but main ones will be red and blue.