Micro pinholes are every spray painter’s nightmare: tiny voids that lurk, only to blossom into little holes when the primer goes on.
U-Pol’s new MicroFill Pinhole Eliminator & Sealer is a single-component, wipe-on paste designed to seal those micro pinholes—and sanding scratches—across virtually any substrate, cutting out costly callbacks and boosting paint shop productivity. Quite simply this is your best form of insurance!
Why MicroFill belongs in your paint shop
Rework is the hidden throttle on throughput. Every time you have to sand back primer, apply more filler and reprime, you lose time, materials and money. MicroFill prevents that cycle by:
Sealing micro pinholes & scratches in one pass—no sink-back, no re-fills.
Reducing primer soak-in by up to 30 %, so you use less product and spend less time topping up.
Speeding cycle times: flash-off in just 15–20 minutes at 20 °C, then prime—no extra sanding required.
Armed with a single 200 ml bag, spray painters can lock down micro defects on steel, aluminium, composites and flexible plastics—bringing a new level of consistency and efficiency to every repair.
Real-world results
Industry veteran Scott Longmuir from Little Knocks Smash Repairs in Brendale, Brisbane can attest to the quality of the product and how it has helped his workshop.
“It’s a fantastic product – we’d been using a competitor’s before we got our hands on U-Pol MicroFill,” he says.
“Immediately we noticed the packaging is superior: the resealable bag means you use 100 % of the product, not half before it dries out.
“And the results are brilliant. We do about 25 cars per week and have used MicroFill on around 100 cars now—two or three bags—with outstanding results. It fills all micro pinholes and scratches with no sink-back. It works a treat. Once you get it out there, everybody will be using it.”
Scott’s experience mirrors the 30 per cent cycle-time savings reported in European trials, where shops consistently cut key-to-key times by sealing micro pinholes early eliminating extra primer coats and repeat preparation passes.
Universal adhesion across substrates
Most pinhole sealers on the market stop at plastics or composites. MicroFill goes further, bonding reliably to:
Polyester filler on steel & aluminium (including galvanised and E-coat)
- SMC and fibreglass panels and bumpers
- Thermoplastic bumpers (TPO, PP, PP+EPDM) without secondary adhesion promoters
- That means you carry one sealer for all your most common repair substrates—no more juggling multiple primers or adhesion aids.
- Simple, Fast, Single-Component Application
- Sand the filler to P180–P240, opening up any tiny scratches.
- Clean with a degreaser (U-Pol System 20 or equivalent).
- Wipe-on MicroFill with a lint-free cloth or squeegee, filling every micro void.
- Flash-off for 15–20 minutes at 20 °C.
- Prime directly—no sanding, no waiting, no hassle.
Because it’s a 1K paste with built-in adhesion promoters, there’s no mixing, no pot life worries and no wasted material. The resealable pouch keeps every gram fresh—even after weeks on the shelf.
Key Features & Benefits
- 200 ml resealable pouch: no wasted product, long shelf life.
- No additional sanding: prime over MicroFill after flash-off.
- Built-in adhesion promoters: ideal for composites and flexible plastics.
- Free from microplastics: meets modern environmental standards.
- One tool for multiple substrates: simplifies your consumables lineup.
By preventing micro pinholes, MicroFill not only saves time and paint—it safeguards your reputation by virtually eliminating pinhole-related callbacks.
Integrating MicroFill into your workflow
Stock only MicroFill for micro pinhole sealing, ditching redundant specialty primers.
Train quickly: a five-minute demo shows new technicians how to wipe, flash and prime.
Measure savings: track primer usage and rework rates before and after adoption.
Looking internationally where MicroFill has been on the market for over 18-months, many collision centres have standardised MicroFill into their refinish processes and have found that a small investment in MicroFill pays for itself in reduced primer consumption, lower labour costs and less rework, resulting in happier customers and increased productivity.
Productivity boost
For Australian paint shops aiming to boost throughput and cut rework, MicroFill Pinhole Eliminator & Sealer is a strategic upgrade and a great insurance policy.
Its broad substrate compatibility—from steel, galvanised steel, aluminium to composites and flexible plastics—sets it apart, while its fast-dry, one-step paste application aligns perfectly with high-volume workflows.
As Scott from Little Knocks Smash Repairs confirms, it does exactly what it says: sealing micro pinholes with zero sink-back and zero waste.
To experience the productivity boost in your own spray shop, contact your nearest U-Pol distributor or visit: u-pol.com.au.