Weathershields, Bonnet Protectors & Roadworthy Compliance

Weathershields, sometimes called window visors or door visors, and bonnet protectors are two of the most common exterior accessories on Australian 4WDs. They're cheap, they look right, and they earn their keep on your LandCruiser 70 Series or Nissan Patrol if it spends time on dirt. They're also two of the accessories an inspector glances at during a roadworthy or pink slip check, because they sit in or near your field of view and because how you fit them decides whether they stay attached at highway speed. What they do, the two fitment methods, what an inspector actually checks, where tint sits in the rules and how to keep them looking good: it's all here.

What weathershields and bonnet protectors do

A weathershield is a moulded acrylic strip that fits along the top of a door window. You can leave the window open a crack in rain so the cabin breathes and demists without water coming in, and you get less wind buffeting and noise while it's open. On a touring 4WD that's genuinely useful. You can vent the cabin overnight at a campsite in light rain without leaving the interior exposed.

A bonnet protector is a clear or tinted moulded shield that mounts to the leading edge of your bonnet. It deflects stone chips, insects and road debris up and over the windscreen, away from the front of the bonnet. On long unsealed stretches it takes the abrasion that would otherwise pit your paint and chip the leading edge. Neither part is a safety device and neither is mandated by the Australian Design Rules. They're convenience and protection accessories, which is why the way you fit them matters more than the parts themselves.

Fitment: tape-on vs clip-in weathershields

Those two styles differ in look and in durability, and picking the right one for your vehicle heads off the usual cause of a visor coming loose down the track. Most 4WD weathershields sold in Australia are tape-on, and fit them correctly and they're reliable for the life of the vehicle. Surface prep is the variable that decides it. You need the mounting area clean, free of wax and silicone, and warm enough for the adhesive to cure. Fit a tape-on visor in cold weather, or onto a freshly polished door, and that's why a shield lifts at one corner a few months later. Prep the surface, press the visor firmly and leave it undisturbed while the adhesive cures, and it'll hold at highway speed.

Bonnet protector mounting

You've got two ways to mount a bonnet protector: rubber or nylon bumpers and bridges that clamp around the front edge, or self-tapping screws and clips into the underside of the bonnet lip. Clamp-style fitment is the better option where the kit allows it, because you're not putting holes in your bonnet. Either way, you need the protector sitting flush with no gap that catches airflow, and every fastener or clip present and tight. A protector that vibrates or lifts at speed is a hazard, and it'll scratch the paint it was meant to protect.

Driver vision and field of view

This is what turns a simple accessory into a compliance question. Anything you fit in or near your line of sight gets assessed against whether it obstructs the view the vehicle was designed to give you. For weathershields that's rarely an issue when the part is the correct one for your vehicle. A properly designed visor sits in the upper corner of the door glass, above the area you use to see the road, your mirrors and traffic. It shouldn't intrude into the main viewing area of the side window.

Trouble starts with oversized, generic or badly fitted visors that sit too low on the glass, or that go on at an angle and cut across your sightline to the door mirror. A bonnet protector raises the same question at the front. A tall or dark protector standing proud of the bonnet line can clip the lower edge of your forward view, and a heavily tinted one makes the bonnet edge harder to judge in low light. The principle behind ADR 93/00 (Forward Field of View) for a headunit screen applies here in spirit, even though the visor itself isn't ADR-regulated: a modification shouldn't eat into the field of view the vehicle was built with.

What roadworthy inspectors check

A weathershield or bonnet protector is rarely the headline item on a roadworthy or registration inspection, but inspectors do check that exterior accessories are secure and don't block vision. Requirements and terminology vary between states, so treat the rows above as a general guide and confirm the specifics with your inspection station or state road authority. Every line comes back to the same three checks: secure, clear of your vision, in good condition. You won't need engineering certification for any of it. These are bolt-on accessories, not structural or safety-system modifications, so they don't trigger the certification schemes that apply to suspension, engine or seating changes. To see which modifications do need sign-off, read the ADR Compliance overview.

Tinting and visor legality

Weathershields and bonnet protectors often come in a smoke or tinted finish, and owners reasonably ask whether that tint falls under the window film rules. It doesn't. Window tint film rules, such as the visible light transmission limits set under ADR 8 and applied through state regulations, cover film and glazing on the window itself, not an external acrylic accessory fitted above the glass. A smoke-tinted weathershield sits outside and above the window line and isn't the window glazing, so the percentage-based limits that govern film don't apply to it the way they apply to your glass.

A dark visor still isn't automatically fine. Driver vision remains the governing test: a heavily tinted visor that's big enough or low enough to obscure your view through the side window or to the mirror becomes a vision-obstruction problem no matter what it's made from. In practice the standard smoke finish on a correctly sized weathershield sits well above your sightline and doesn't come up. Same logic on a tinted bonnet protector. The colour itself isn't regulated, but a protector dark enough or tall enough to interfere with your forward view of the road is. Keep the part vehicle-specific and correctly sized and you'll rarely have to think about tint at all.

Care, cleaning and longevity

• Wash it, don't scrub it. Rinse the loose dirt and dust off first so you're not grinding grit into the surface. Soft microfibre and plenty of water, same as you'd use on paint.
• Keep solvents and abrasives away. Petroleum solvents, strong degreasers and cutting compounds can craze or cloud acrylic. Car wash shampoo or a plastic-safe cleaner is what you want.
• Mind the tape line. On tape-on weathershields, don't blast the mounting edge at close range with a high-pressure washer, which can work the adhesive loose over time.
• Restore mild scratches. You can often improve light hazing on a bonnet protector with a plastic polish made for headlights and acrylic. Deep scratches and crazing are permanent.
• Check the fasteners. After heavy corrugations, look over the bonnet protector clips and the visor corners. Catch a lifting corner early and you can re-seat it before it fails at speed.

Acrylic weathershields and bonnet protectors are durable, but they're plastic, and abrasion and harsh chemicals are what kills them. Clear or smoke acrylic scratches more easily than painted steel, and attack it with the wrong cleaner and it can craze or yellow. Treat yours the way above and a quality shield or protector stays clear and secure for years and thousands of kilometres of touring. Get the fitment right and wash it gently, and you'll still have a part that looks right when you sell rather than one that looks tired in two years.

Choose the right part for your vehicle

Fit a vehicle-specific part rather than a generic universal one. A weathershield moulded for a 79 dual cab, a 76 wagon or a particular Patrol generation follows the exact curve of that door and sits where it should, above your sightline and flush to the frame. Trim a generic shield to fit and you're where the vision, fit and security concerns above tend to begin. Bonnet protectors work the same way: buy a model-specific protector and it matches the bonnet contour and the factory mounting points, so it sits flush and clamps securely with nothing modified.

The same principle covers door speaker pods, headunit upgrades and interior trim if you've got the vehicle apart anyway, since parts designed for your exact model fit and finish better than universal alternatives. Take a look at our front and rear speaker door pods for the 70 Series 79 dual cab and 76 wagon, engineered for the vehicle they're made for.

Related guides

• Find out which modifications need certification, the hub explaining Australian Design Rules and what they mean for modified 4WDs.
• Browse vehicle-specific audio, upgrades for the 70 Series, Patrol and more.
• Compare our headunits, plug-and-play and vehicle-specific, and they keep your factory steering controls.

Those three cover the broader picture on which 4WD modifications need certification, which are straightforward bolt-ons, and where to get parts that fit your vehicle the way they should.

Common questions