8 Fairfax St SE
NAPA Auto Parts Genuine Parts Company
8 Fairfax St SE
Leesburg,  VA  20175
(703) 777-2055
Reserve Online Participant
Store Hours
Mon-Fri:7:30 AM-7:00 PM
Sat:8:00 AM-5:00 PM
Sun:9:00 AM-5:00 PM
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Bar's Leaks Block Seal Head Gasket Sealant

Bar's Leaks Block Seal Head Gasket Sealant

Part #: NCB 1100
Line: NAPA Consumer Brands

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Features & Benefits

Warranty: Standard : No Warranty, Expressed or Implied


For most vehicles, this is the last chance before going to a junk yard or paying an expensive repair bill. This product contains a blend of aramid and refractory fibers giving the strength of a bullet proof vest and the heat resistance of fire-proof clothing. As these particles penetrate a crack or the blown head gasket area, they lock together and bond forming a hard permanent ceramic type seal. Your vehicle is a good candidate for this product if it can idle for 20 minutes without overheating or having to add coolant. Works effectively on cast iron or aluminum blocks & heads. Detailed instructions on back booklet label take you through each step of using the product.

  • Stops All Coolant Leaks
  • Repairs Intake Gasket Leaks
  • Repairs Blown Head Gaskets
  • Repairs Cracked Heads & Blocks


Brand Bar's Leaks
Container Size 20 fl oz (US)
Volatile Organic Compound (VOC) Rating 0 VOC
Acts as Stop Leak Yes
Contains VOCs No
Manufacturer Bar's Leaks
VMRS Code 053999003
Stop Leak Application Head Gasket Repair Designed Especially For Repair Of Blown Head Gaskets, Stops Block Leaks, Seals & Cracked Heads
SDS Required Yes

Safety Information

Vehicle Fitment Guide

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