We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small clear tube of Pro-Seal 80066 RTV silicone sealant 3 oz

Pro-Seal

Pro-Seal 80066 RTV Silicone Sealant 3 oz Clear

SKU CH-DSD4-DHN5W

Clear RTV silicone paste seals gaps up to 0.25 in, cures in one day at room temperature and withstands -75 to 400 °F

  • Color/FinishClear
  • Waterproof seal holds from -75 °F to 400 °F
  • Ready for service in one day at room temperature
  • 10-minute work window lets you position parts
  • Fills gaps up to .25 in with flexible Shore A27-A30 bond
  • Acetoxy silicone resists water on metal surfaces

Pro-Seal 80066 RTV Silicone Sealant

Pro-Seal 80066 is a clear acetoxy silicone paste supplied in a 3 oz tube. It forms a water-resistant gasket on metal surfaces and cures at room temperature. Full cure is reached in one day with a ten-minute working time. The sealant operates from -75 to 400 degrees Fahrenheit.

Suited for gasket repairs and sealing tasks

This product suits anyone needing a flexible, water-resistant seal on metal with a 0.25 inch maximum gap fill. It is not for buyers who require a different chemical base or a larger gap-filling capacity. It is also not for applications that exceed the stated temperature limits or cure requirements.

0.25 inch maximum gap fill

The maximum gap fill of 0.25 inch is the critical specification that determines fit. Gaps wider than this limit will not seal reliably with this paste. Verify the joint width before purchase to ensure the sealant can perform as intended.

Highlights

  • Waterproof seal holds from -75 °F to 400 °F
  • Ready for service in one day at room temperature
  • 10-minute work window lets you position parts
  • Fills gaps up to .25 in with flexible Shore A27-A30 bond
  • Acetoxy silicone resists water on metal surfaces

Specifications

Color/FinishClear
BrandProseal

Questions about this item

Does the Pro-Seal 80066 tube include the nozzle or do I need to buy it separately?

The 3 oz tube includes the nozzle in the box, so no separate purchase is needed for application.

Should I choose this Clear 3 oz version or a different size for a 0.25 in gap repair?

This 3 oz Clear tube handles gaps up to 0.25 in; select a larger tube only if the total joint length exceeds what this volume can cover.

What does the 400 °F maximum temperature mean when the sealant is inside an engine?

It means the cured silicone stays flexible and sealed up to 400 °F, suitable for high-heat areas like valve covers or thermostat housings.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.