The Unibit drill makes a clean perfectly round 1/2" hole.
Use the pk of 25 Plastic Plugs (16004) to plug the holes.
Use mineral spirits, enamel reducer, or kerosene to purge system after using. Heavy Duty Anti-Rust and Rubberized Undercoating can be thinned with mineral spirits for improved spraying if needed.
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WARNING - Cancer and Reproductive Harm - www.P65Warnings.ca.gov