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How to Apply Pioneer Flare Leak GuardUpdated 8 months ago


Applying Pioneer Leak Guard during Installation

Leak Guard is a gasket and thread sealant used in HVAC/R systems, and is commonly applied to flare fittings to ensure a tight, leak-free seal. 

Pioneer Leak Guard packet

Here's the safest and most effective way to apply Pioneer Leak Guard to flare mating surfaces: 

  1. Safety First: Always remember to wear gloves and safety glasses when working with HVAC/R systems and using sealants. This will help to protect your skin and eyes from potential irritants or injuries.
  2. Clean the Surfaces: Before applying Leak Guard, clean both mating surfaces thoroughly. Use a cloth to wipe off any dirt or oil. Then, use a mild solvent if necessary, to ensure that the surfaces are completely clean. This will help the Pioneer Leak Sealer to bond effectively.
  3. Apply the Leak Guard: Dip a small brush or the tip of your finger into the Leak Guard. You don't need a large amount – just enough to thinly coat the flare's mating surfaces.Coat Surfaces Evenly: Apply the Leak Guard evenly on the mating surfaces. The goal is to create a thin film over the entire surface.
  4. Connect the Surfaces: Once you've applied the Leak Guard, connect the flare fitting as you normally would.
  5. Tighten the Fitting: After connecting, tighten the flare fitting. Be careful not to over-tighten, as this can strip the threads or crack the flare. 
  6. Wipe off Excess Leak Guard: After the fitting has been tightened, wipe off any excess Leak Guard that may have been squeezed out.


Remember, Leak Guard is not a replacement for properly flaring and tightening a connection. It should be used as a supplement to these steps to ensure a tight, leak-free connection. Always follow the manufacturer's instructions for both the Leak Guard and the fittings you are using.

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