FREE Shipping on orders over $150 (Weight Restrictions Apply)
This is a heavy-duty version of the Dynax S50 designed to go on the underbody of cars.
It's a large (750ml) aerosol spray.
Jack the car up and spray liberally over the underside of the car/ trailer / caravan to protect it from rusting. Ideal for people who live close to the sea or use their vehicles on the beach.
Good for Boat trailers, it might not look pretty but it works.
It was designed for car underbody use in the UK with salt spray on the icy roads, notorious for causing rust.
It won't crack like the bitumen-based normal underbody protectors that dry out in time, crack and then allow water into the metal with the invertible rust that follows.
It leaves a dark brown finish.
Dynax-UB is a high-performance anti-corrosion wax that provides long-lasting steel surface protection.
Dynax-UB contains elastic polymers that create a tougher wax coating that is more resistant to abrasion than normal wax coatings – this property enables this wax to protect vehicle undersides for prolonged periods.
Unlike traditional bitumen underseals, Dynax-UB will not peel. Peeling underbody coatings trap water against the steel surface, accelerating corrosion.
Dynax-UB forms a touch-dry, brown, wax-like film.
Dynax-UB can arrest existing corrosion and provide long-term protection to pre-corroded and corrosion-free surfaces.
Dynax-UB substantially outperforms competitive material in salt-spray trials under conditions of ASTM B117. Salt-spray performance should never be overlooked as vehicle undersides and cavities are always exposed to this attack from winter road salt.
Aerosol Dynax-UB: Large 750ml aerosol comes with a standard spray head and straw attachment to get into nooks produces professional ‘stippled’ finish.
1ltr Pail Dynax-UB:
The viscous formulation for application with a brush or roller.
5ltr Jerry Can Dynax-UB:
A formulation for use with compressor and suitable spray equipment.
Use a brush or roller to apply Dynax-UB. Dynax-UB should be applied to dry surface free of loose, flaky rust or coatings, although the highly polar corrosion inhibitors will arrest existing corrosion.
Dynax-UB will vary in viscosity with temperature; it may appear to have a soft grainy appearance to firm gel. Apply at least two coats to the surface at 24 hr intervals. This first primes the surface and allows subsequent coats to build higher film thickness.
Dynax-UB will provide excellent protection at a wide-range of film thickness. Aim to achieve a uniform dry-film thickness of around 80 – 100 microns.
Please be advised this product is DG Aerosol cannot be sent by Express Post (Air) only by road
Please allow extra time for delivery to regional and remote areas.
Free Shipping on orders over $150 excluding remote areas and certain weight restrictions apply for free shipping in each state. Trade accounts $250 minimum for free shipping.
The following qualifies for free shipping:
For orders with free shipping, we determine whether to use a courier service or Australia Post based on the address. If you prefer your order to be shipped via Australia Post, please select the "Parcel Post" option at checkout.
Note: We do not ship to PO Boxes or Parcel Lockers with free shipping.
If your parcel is returned to us, the following conditions outline when additional shipping costs may apply:
*We will not be held responsible for delays or late delivery of Australia Post or courier services.
*If a parcel does not arrive as anticipated, please allow 5-7 working days for Australia Post or couriers to complete process of tracking and locating as in most cases it turns up after 3-7 days of expected delivery. We cannot refund or send another item until this process is completed.
*We don't take responsibility for orders that are lost or stolen once the parcel has been delivered to the correct delivery address.
*Items that are over 21kg may require to pay extra freight costs if in regional or remote areas - we will contact you if this is the case.
All of our prices are in Australian dollars (AUD) and include GST (Goods and services tax)
At Detailing Shed, we're committed to supplying premium-grade car care products. Please review the following before submitting a return or refund request.
Version 1.2 · Last updated: 18 August 2026
| Topic | Summary |
|---|---|
| Change-of-mind returns | Store credit only, within 30 days of delivery, unopened & unused |
| Restocking fee | 10% of item price |
| Return shipping | Paid by the customer |
| Non-returnable | Chemicals/liquids, Ceramic Coatings, and all Kranzle & Big Boi products |
| Faulty / damaged / incorrect items | Report within 10 days: repair, replacement or refund, no fee |
| Order cancellation (before dispatch) | Refund to original payment method, minus 3% transaction fee |
| Missing deliveries | Allow 7–15 business days after carrier investigation begins |
| New Zealand orders (polishers/buffers & pressure washers) | Customer pays return shipping for repair, inspection or warranty claims, even if a fault is confirmed |
Nothing in this policy limits or replaces your rights under the Australian Consumer Law (ACL). If a product has a major or minor failure (for example, it's faulty, unsafe, not fit for purpose, or significantly different from how it was described), you're entitled to a repair, replacement, or refund under the ACL, regardless of the store credit, restocking fee, or timeframe terms below.
The terms in the rest of this policy apply to change-of-mind returns and other situations that aren't covered by a consumer guarantee.
We accept change-of-mind returns for store credit only, on items that are unopened and unused, within 30 days of the delivery date.
Due to safety, hygiene, and quality control, the following are never eligible for change-of-mind return:
Unused, unopened accessories such as brushes, pads, and towels may be eligible, subject to approval from our team. Email us first with your order number and photos before sending anything back.
If you believe a product isn't working properly, contact us first rather than returning it straight away. Here's how we handle it:
If you've told us in advance the specific job you needed a product to do and it can't do that job, let us know. That can still count as a failure under the ACL even if the product otherwise works normally.
For orders shipped to New Zealand, if a polisher/buffer or pressure washer needs to be sent back to us for inspection, repair, or a warranty claim, return shipping is paid by the customer. Given the cost of international freight, we're not able to cover shipping on these two product categories for New Zealand orders, even where a fault is confirmed.
Yes, if you ordered the wrong product, return it under the policy above and place a new order for the correct item.
You can cancel an order any time before it's been processed or shipped. A 3% transaction fee (covering payment processing costs) is deducted from the refund; the remainder goes back to your original payment method.
Once an order has been processed or dispatched, it can no longer be cancelled, but you can still return the items under the Change-of-Mind Returns policy above.
Notify us within 10 days of delivery at info@detailingshed.com.au with your order number and clear photos. We'll arrange a replacement, or a refund if stock isn't available, at no cost to you. If we need the item sent back to us first, we'll cover or reimburse that return shipping too, since the item is faulty, damaged, or incorrect rather than a change of mind (this doesn't apply to New Zealand orders for polishers/buffers and pressure washers, per above).
For any return worth over $50, we recommend a trackable shipping service or shipping insurance. We're not responsible for returned items lost in transit.
If your order hasn't arrived, please allow 7–15 business days after Australia Post or the courier begins their investigation. We'll be in touch once it's resolved and any refund or replacement has been processed.
Product packaging or colours may differ from the images on our site due to manufacturer updates. This isn't grounds for a refund unless the product itself is faulty or incorrect.
Discount codes must be applied at checkout and can't be added retroactively to an existing order, and we can't refund the difference after an order is placed. Double-check your code before completing checkout. If it's not working, contact us before you finalise your purchase.
| Version | Date | Changes |
|---|---|---|
| 1.0 | 18 Aug 2026 | Initial rewrite: added the Australian Consumer Law rights section, the “isn’t performing” walkthrough, the at-a-glance summary table, and this version history. Clarified the Kranzle/Big Boi exclusion covers the full brand range (not just liquids/chemicals), removed Flex Tools from the non-returnable list, and clarified the 3% cancellation fee applies when refunding to the original payment method. |
| 1.1 | 18 Aug 2026 | Added a New Zealand orders clause: for polishers/buffers and pressure washers, the customer pays return shipping to send the item back for repair, inspection, or a warranty claim, even where a fault is confirmed. |
| 1.2 | 18 Aug 2026 | Clarified that for domestic (Australian) faulty, damaged, or incorrect items, Detailing Shed covers or reimburses return shipping (not just the replacement/refund), with the New Zealand polisher/buffer and pressure washer exception carved out. |
We're here to help
If you need to contact us for advice on any of the products, please email us at info@detailingshed.com.au
Please include description of the product you are interested. Some info of you car, and also what you are trying to achieve.
We may also review our blogsfor product recommendations.