Tapered Silicone Plugs for 30 oz Yeti Tumblers - 600°F Powder Coat Masking Plugs

These silicone plugs are masking tools for powder coating 30 oz Yeti-style thermal tumblers. Inserted into the cup opening before coating and curing, they prevent powder from entering the interior and eliminate the need for tape masking, resulting in a cleaner, sharper finish boundary.

The 30 oz Yeti cup silicone plug measures 4.055 inches at the top diameter, 3.267 inches at the bottom diameter, and 1.500 inches in length. The tapered taper design provides a snug, self-sealing fit in the cup opening without any adhesive or hardware.

These silicone masking plugs are rated to 600°F (315°C), which is well above the 375°F–450°F range used in standard powder coat cure cycles. They will not melt, warp, or leave silicone residue on the cup's interior during or after the cure process.

Insert the tapered silicone plug snugly into the top opening of the 30 oz Yeti tumbler. Apply powder coat to the exterior of the cup using your preferred gun and booth setup. Cure in the oven at the powder manufacturer's specified temperature. Once cured and cooled, remove the plug to reveal a clean, professional interior-free coating with no tape line.

Yes. These high-temp silicone plugs are reusable. After each cure cycle, allow the plug to cool completely before removing. Wipe off any excess powder overspray and store in a clean container. Replace plugs when they exhibit tearing, compression set, or a loose fit that could allow powder bleed.

The 30 oz plug is larger - 4.055" top diameter vs. 3.543" for the 20 oz version - reflecting the larger opening of the 30 oz tumbler. Both are 1.500" long and rated to 600°F, but using the wrong size for your cup format will result in a loose fit and potential powder bleed. Always match plug size to cup size.

Tapered silicone plugs for 30 oz thermal cups are available at $12.44 from Creative Coating Solutions at creativecoatingsolutions.com. In-stock items ship within 2–4 business days. CCS also carries silicone plug sizes for 20 oz cups and water bottle-style tumblers.