High Temp Masking Supply 235-Piece Silicone Rubber Plug Set — High‑Temp Tapered Stoppers, Reusable

High Temp Masking Supply 235-Piece Silicone Rubber Plug Set is a complete assortment of high-temperature silicone tapered plugs designed to seal holes, threaded or unthreaded, up to 1" diameter for coating and finishing jobs.

This kit gathers a broad range of silicone stopper-style plugs so you can block, mask, and protect openings during powder coating, painting, ceramic coatings, sandblasting, and other high-heat finishing processes. All pieces are tapered for a secure fit, manufactured from flexible silicone rubber that resists elevated temperatures and is reusable. The set contains 235 plugs in six larger sizes and five smaller size groups to cover delicate precision work up through larger industrial openings.

How does this plug set simplify masking for powder coating and painting?

The assorted sizes mean you can quickly match a plug to the hole without stretching or trimming, saving setup time and reducing masking errors. Silicone compresses to fill irregularities while the tapered profile locks the plug in place during handling and coating.

• 235 total plugs across a wide size range (1/32"–1").
• Tapered stoppers for secure, vibration-resistant sealing.
• Flexible silicone conforms to threaded and smooth bores.

What temperature and material benefits do these silicone plugs offer?

Made from high-temperature silicone rubber, these plugs tolerate the heat exposure typical of curing ovens and other finishing operations without melting or deforming like many plastics. The non-toxic, elastic compound returns to shape after use, extending service life and enabling multiple reuses.

• High-temp silicone resists oven curing temperatures encountered in coatings.
• Non-toxic material suitable for industrial finishing environments.
• Durable and reusable for cost-effective masking across jobs.

Which sizes are included and how are they distributed in the kit?

The kit is arranged to balance common small sizes with larger diameters up to 1" so you have coverage for both precision and bulk applications. Quantity distribution focuses on the smallest sizes (higher counts) and provides multiple pieces of larger plugs for less frequent but necessary fits.

• Smallest two sizes: 50 pieces each (1/32"–3/16").
• Three medium sizes: 25 pieces each (1/8"–3/8").
• Six larger sizes: 10 pieces each (3/8"–1").

Can these plugs be used on threaded holes or only smooth bores?

The tapered stopper profile works on both smooth and threaded openings: the flexibility lets the plug wedge into threads while the taper helps create a snug seal without extensive modification. For heavily damaged threads or very coarse pitch, test fit a single plug before full application to confirm sealing performance.

• Works on threaded and unthreaded holes up to 1" diameter.
• Flexible material adapts to minor thread profiles and imperfections.
• Recommended test-fit for unusual or heavily damaged threads.

Who is this for: This 235-piece High Temp Masking Supply kit is ideal for professional coaters, autobody shops, restoration specialists, manufacturing lines, and serious DIYers who need reliable hole plugs for high-heat finishing and masking. If you frequently switch between small fasteners and larger openings, or if you require reusable, heat-resistant masking that reduces rework, this kit covers the most common sizes you’ll encounter.