High Temp Masking Supply XL Silicone Plug Set 20-Piece, 3/4"–1-7/16" Heat-Resistant Reusable

High Temp Masking Supply's 20-piece XL silicone plug set are tapered, reusable stoppers sized to seal and protect holes from 3/4" to 1-7/16" during powder coating, painting, blasting and similar processes.

This kit provides heavy-duty silicone plugs engineered for larger openings where a secure, heat-resistant seal is essential. Each plug is made from a premium silicone compound rated for short-term exposure up to 600°F (315°C), resists many common chemicals, and is color-coded so you can find the right size at a glance. The set includes 20 tapered plugs spanning the range of interior diameters listed, giving you a versatile assortment for automotive, industrial, or workshop tasks.

How do these plugs perform under high heat?

The silicone compound is formulated to tolerate elevated temperatures for brief cycles typical of powder coating and similar processes. It will maintain shape and sealing ability through a single or short exposure at temperatures up to 600°F (315°C).

• Rated to withstand up to 600°F (315°C) for at least 20 minutes.
• Keeps elasticity and shape after heat exposure, unlike cheaper plastics.
• Suitable for short thermal cycles in coating and curing operations.

Which hole sizes and applications does the set cover?

The 20-piece assortment covers tapered stops that fit interior diameters from 3/4" (0.750") up to 1-7/16" (1.437"), making it suitable for larger ports and access holes. Use them whenever you need a temporary but reliable seal.

• Sizes span .750" to 1.437" ID to match common large holes and fittings.
• Designed for powder coating, painting, anodizing, plating, and blasting.
• Color-coded sizes let you quickly pick the correct stopper without measuring.

Are these plugs reusable and chemically resistant?

Yes—these stoppers are made to be flexible and reusable while resisting cracking, shrinking, and hardening over time. The silicone is chosen for durability and broad chemical compatibility encountered in finishing shops.

• Premium silicone construction resists cracking, hardening, and shrinkage.
• Reusable across multiple jobs when cleaned and stored properly.
• Holds up against common coatings, solvents, and cleaning agents used in finishing.

How are the plugs packaged and identified?

The kit contains 20 plugs in multiple sizes and each size is color-coded so you can identify the right taper quickly during prep and production. The color will not bleed or fade, giving a long-lasting visual cue on the workbench.

• Twenty pieces in a compact kit covering the XL size range of common holes.
• Distinct color-coding for rapid size recognition and workflow speed.
• Durable finish won’t bleed or discolor nearby parts or fixtures.

Who is this for: This 20-piece XL Silicone Plug Kit from High Temp Masking Supply is aimed at powder coaters, custom painters, auto restorers, metal finishers, media blasters, labs, and serious DIYers who work with larger holes and need a dependable, heat-tolerant temporary seal. If your projects require quick, reusable plugs that tolerate short high-heat cycles and resist common chemicals, this set is designed to reduce prep time and protect internal passages during finishing operations.