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. O) — 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
| Item | Spec |
|---|---|
| Brand / Series | Refrigeration Technologies — Big Blu |
| Product | Big Blu Brush-On (spot leak detector) |
| Applicator | 10" telescopic dauber (integrated) |
| Compatibility | All common refrigerants & oxygen service (Big Blu formulation) |
| Material Safety | Non-corrosive to metals, plastics & rubber |
| Food-area use | NSF (Big Blu line) |
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
Use both. Brush-On excels in tight spaces and for targeted checks. Pair it with an electronic sniffer to speed up diagnostics and avoid repeat visits. For handheld sniffers, see Related Products below.
Yes — Big Blu is non-corrosive to metals, plastics and rubber when used as directed.
Yes — the Big Blu formulation is oxygen-safe. Follow site safety procedures and rinse/wipe where appropriate.
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.