Built for tradies: VIPER Big Blu Brush On is a pro-grade spot leak detector for HVAC/R. The film forms tight bubbles so you can see tiny leaks on flares, braze joints and valves — even where a spray can’t reach. Comes with a 10" telescopic dauber to get into awkward spots — too easy. Features drawn from the live HVAC Shop listing.

Key Features & Trade Benefits

• Brush-on applicator with 10" telescopic dauber — reach packed cabinets and ceiling cavities without juggling extra tools; quicker checks, fewer hassles.
• Highly visible bubble action — micro-leaks show as tight bubbles/foam so you can pinpoint the fault and move on; fewer call-backs.
• Non-corrosive formulation — safe on metals, plastics and rubber; kinder to coils and seals on repeat use.
• Works on pressurised systems, all common gases (incl. O₂) — one bottle covers mixed sites and jobs.
• Food-area friendly (NSF Big Blu formulation) — suitable around food handling when used as directed.

Why This Product Matters

Quick yarn: service call on a deli case drifting warm — tight space behind the kick panel. Spray wand wouldn’t reach a suspect flare, so we dabbed Big Blu Brush On with the telescopic dauber. A neat cluster of bubbles popped up straight away. Re-flare, torque, re-test and she was back on setpoint before smoko. That’s a fair dinkum time-saver.

Need more leak-finding gear? Check our Leak Detectors category for electronic sniffers to pair with your bubble testing.

Pro Tip

Lay a flat, bubble-free film and give fittings a minute or two. Tap the pipe or run the unit to introduce vibration — micro-leaks love to show themselves then. Wipe clean after testing. No dramas.

Compatibility & System Info

• Gases: Suitable for common HVAC/R refrigerants and oxygen service per Big Blu formulation guidance.
• Use cases: Refrigerant lines, flare nuts, compressor fittings, valves, coils, and gas lines; ideal for tight access and overhead work.
• Local note: In Sydney humidity or a hot Brisbane plant room, a brush-on beats overspray and keeps the film where you need it — bloody good on tidy installs.

What’s Included

• VIPER Big Blu Brush-On leak detector
• 10" telescopic dauber (integrated in cap)
• Usage directions on label

Specifications

Specs and inclusions confirmed against HVAC Shop’s live product listing and Big Blu formulation guidance. Always follow SDS and site procedures.

Warranty & Returns

Backed by store support. See our Shipping & Returns policy for warranty and returns info.

FAQs

Related Products

• Fieldpiece DR82 Infrared Leak Detector — a helpful partner to Brush-On for finding the source quickly.
• Testo 316-3 Leak Detector — handy for verification after bubble testing.
• Viper Big Blu SubZero 3.78 L — when you’re working in cold rooms or winter jobs, this is a ripper.
• Bradley NR1000 Nitrogen Regulator — makes pressure testing consistent before you soap joints.

Stay compliant with leak testing and handling — see AIRAH resources and the Australian Government guidance for RAC technicians.