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 purple solid stick sealant in 19 g tube

Loctite

Loctite 640804 High Tack Gasket Sealant 19 g Purple

SKU CH-ZNK3-5VJTG

Anaerobic gasket sealant cures in one day, holds from −65 °F to 300 °F and works with fuels, water and automotive fluids

  • Anaerobic cure locks joints in 5 minutes
  • Solvent-free semisolid applies cleanly from 19 g stick
  • Withstands -65 °F to 300 °F for engine use
  • Resists acetone, fuels, ethanol and water
  • Series 534 formulation seals cork and similar materials

High-Tack Gasket Sealant Stick

Loctite 640804 is a solvent-free semisolid gasket sealant supplied in a 19 g purple stick. It is designed for mechanics and technicians who need a clean, controlled application on cork gaskets without liquid drips.

Anaerobic Cure Up to 300 °F

The anaerobic formulation cures fully in one day at room temperature with a five-minute working window. It remains stable across a continuous operating range from -65 °F to 300 °F and resists automotive fluids, fuels, ethanol, acetone and water.

Stick Format Simplifies Assembly

The solid stick form eliminates the mess of paste tubes and allows precise placement on gasket surfaces. No separate applicator or mixing step is required, reducing preparation time during reassembly of flanged joints.

How it compares

Measured against everything we stock in Caulking & Sealing Supplies, at today’s prices. Recalculated every night.

Price $14.99
Cheaper than about 57% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameLOCTITE

Questions about this item

How is the 19 g purple stick applied and what step do installers often skip?

Clean both surfaces, twist the stick to expose fresh material, coat each flange evenly, assemble within the 5 min working window, then let the anaerobic cure develop for 1 day before pressurising.

What maintenance or replacement will the cured gasket need later?

The sealant remains a flexible solid across the -65 °F to 300 °F range and resists acetone, ethanol, fuels and water, so the joint only needs replacement if the flange is disassembled or damaged.

What limit appears first during sustained high-temperature operation?

Continuous exposure above 300 °F exceeds the maximum operating temperature and will degrade the anaerobic bond before any other property fails.

More in Caulking & Sealing Supplies

Similar items