PPG Hammertone Guide: Learn Hammertone Finishes 101
What Is PPG Hammertone and Why Does It Matter?
This PPG Hammertone Guide covers everything you need to know about hammertone finishes, from what they are and how they work, to how to apply them correctly and where to buy them in Australia.
Quick overview:
- What it is: A specialist coating that dries to resemble hammered metal, created using minerals like mica suspended in a lacquer base
- Available forms: Liquid paint (such as APM PU Hammertone Finish) and powder coating
- Best used on: Metal, timber, masonry, and some plastics
- Key benefit: Hides surface imperfections without heavy sanding, while delivering corrosion and UV protection
- Performance: Passes 1000 hours of salt spray resistance (ASTM B-117) and humidity resistance (ASTM D-1735)
- Powder coating bake schedule: 15 minutes at 190 degrees Celsius (375 degrees Fahrenheit) metal temperature
- Colour options: 42 curated colours in the PPG range, including RAL Classic references
- Where to buy: Available through authorised distributors like Eastern Auto Paints
Whether you are refinishing a trailer, coating industrial machinery, or restoring a metal gate, PPG Hammertone delivers a finish that is as practical as it is visually striking. It is a product that has earned genuine respect in workshops across Australia, and for good reason.
I'm James Maranis, owner of Eastern Auto Paints, and with over 30 years in the coatings industry, I've seen how the right hammertone product can transform a tired piece of equipment into something that looks purpose-built and lasts the distance. This PPG Hammertone Guide draws on that hands-on experience to give you the clearest, most practical advice possible.
Understanding Hammertone Finishes and Their Composition
When we talk about a "hammertone" finish, we are referring to a specialist coating that creates a unique visual effect. Once dry, the surface looks as though it has been beaten with a ball-peen hammer. This isn't just for aesthetics; the "dimpled" look is incredibly functional.
In our experience at Eastern Auto Paints, hammertone is the go-to choice for covering up unsightly pits, scratches, or weld marks on metal surfaces. Because the pattern is intentionally uneven, it tricks the eye, making surface defects practically invisible. You can learn more about the variety of these coatings in our article on understanding hammertone paint colours suppliers and finishes.
The composition of these paints is quite fascinating. They typically feature a high-quality lacquer base that holds specialised minerals in suspension. These minerals, often mica, provide an iridescent, shimmering quality that adds depth to the finish. To get that iconic "hammered" crater effect, manufacturers like PPG add a small amount of silicone oil. This oil disrupts the surface tension of the paint as it dries, forcing the pigments to pull away and form the characteristic patterns.
The Science Behind the PPG Hammertone Guide
The technical magic of the PPG Hammertone Guide lies in how these suspended minerals interact. Mica is a naturally occurring mineral that is ground into tiny flakes. These flakes are highly reflective and offer excellent scratch resistance once cured.
In some formulations, aluminium or bronze powder is used instead of mica to achieve different metallic hues. As the solvent evaporates, the silicone oil causes "Benard cells" to form—essentially tiny whirlpools in the wet film. These cells fix the metallic flakes into the dimpled pattern we see. This process doesn't just look good; it creates a tough, interlocking layer of minerals that provides superior protection against the elements.
Liquid vs. Powder Coating Hammertone
Depending on your project, you might choose between a liquid application or a powder coating. Each has its place in the workshop.
Liquid hammertone, like the APM PU Hammertone Finish, is a polyurethane enamel. It is versatile because you can apply it with a brush, roller, or spray gun. It is perfect for on-site repairs or large items that won't fit in an oven.
On the other hand, PPG powder coatings like Precision Tan River Hammertone offer extreme durability. These are "made-to-order" industrial products that require an electrostatic spray setup and a curing oven. They are UL approved and designed for high-stress environments like electrical cabinets or shopping carts.
| Feature | Liquid Hammertone (APM PU) | Powder Coating Hammertone |
|---|---|---|
| Application Method | Spray, Brush, Roller | Electrostatic Spray |
| Curing Process | Air dry or low bake | High-temp oven bake |
| Durability | High | Exceptional |
| Gloss Level | Semi-gloss to High Gloss | High Gloss |
| Best Use | Trailers, machinery, DIY | Industrial parts, bulk production |
| Surface Prep | Standard degreasing | Strict cleaning/pretreatment |
Key Benefits and Performance Standards
The biggest drawcard for the products mentioned in this PPG Hammertone Guide is the sheer level of protection they offer. Beyond the "cool factor" of the metallic look, these coatings are built for industrial-grade punishment.
Because the finish is so effective at hiding flaws, it saves a massive amount of time on prep work. On many uneven surfaces, you can skip the heavy sanding and multiple layers of filler that a standard gloss paint would require. For a deeper look at how industrial coatings streamline your workflow, check out industrial coatings made easy a deep dive into PPG selemix.
Durability and Resistance Testing
When we recommend a product, we look at the data. PPG Hammertone coatings are put through rigorous testing to ensure they meet international standards.
- Salt Spray Resistance (ASTM B-117): These coatings can withstand 1000 hours of continuous salt spray without failing. This makes them ideal for trailers or equipment used in coastal areas of Victoria.
- Humidity Resistance (ASTM D-1735): They also pass the 1000-hour humidity test, ensuring the paint won't blister or peel in damp environments.
This level of industrial longevity is why you see hammertone on everything from heavy-duty pumps to outdoor railings. It is a "set and forget" coating that keeps rust at bay for years.
Substrate Versatility
While most people think of hammertone for metal, it is surprisingly versatile. With the right priming requirements, you can apply these finishes to:
- Metal: Steel, aluminium, and galvanised surfaces (requires an etch primer).
- Timber: Great for decorative accents or toolboxes.
- Masonry: Used in some light industrial settings for protective wall coatings.
- Plastics: Certain hard plastics can be coated if the surface is properly keyed.
For those using advanced polyurethane versions, our PPG performance polyurethane topcoat guide provides additional technical details on achieving a high-end finish with Performance Polyurethane Topcoat (PPT). For enamel-based projects, Performance Enamel Topcoat (PET) is the industry standard.
Professional PPG Hammertone Guide for Best Results
Getting a professional result with hammertone is all about controlling the "crater" formation. If the paint is too thin, the pattern won't form; if it is too thick, it may sag.
We’ve found that most adhesion issues come down to poor surface prep. Even though hammertone hides scratches, it won't hide grease or loose rust. Start by degreasing the surface thoroughly. If you are working with a previously painted surface, use our high-quality sanding sheets (ranging from 80 grit to 2000 grit) to scuff the area.
Step-by-Step PPG Hammertone Guide for Trailers and Equipment
If you are tackling a trailer restoration in your Melbourne workshop, follow this process:
- Cleaning: Wash the trailer with a strong detergent and use a degreaser to remove all road grime and oils.
- Rust Removal: Use a wire brush or abrasive disc to remove loose rust. For stubborn spots, we recommend a rust converter.
- Priming: This is a direct to metal product, however we do recommend priming for extra protection. Apply a coat of Concept 103 Etch Primer or Protec PPG Grey/Black Etch Primer. This ensures the hammer tone has something beneath it that has already formed a layer of protection.
- Mixing: Stir the paint thoroughly. Do not use a mechanical shaker if possible, as it can introduce too many air bubbles. If thinning is required for your spray gun, use AER20 in this instance.
- Application: Using one of our spray guns, apply 2-3 even coats. Following the suppliers TDS for best results
Safety, Handling, and Regulatory Compliance
Safety is non-negotiable when working with industrial paints. Liquid hammertone is a flammable liquid with a flash point of 24°C (75°F). This means it can ignite at room temperature if an ignition source is present.
Always work in a well-ventilated area. For professional spray applications, a standard paper mask isn't enough. We strongly recommend using PPE masks or, ideally, air-fed masks to protect against isocyanates and solvent vapours. To manage waste responsibly, many of our industrial clients use solvent recycling machines to clean their equipment and reuse thinners.
Exposure Limits and Chemical Safety
The solvents in Hammertone paints have specific exposure limits that must be respected.
- n-butyl acetate: 150 ppm TWA (Time Weighted Average).
- Xylene: 100 ppm TWA.
In simple terms, these chemicals can be harmful if inhaled over long periods. Under GHS (Globally Harmonised System) classifications, some components are linked to reproductive toxicity, so pregnant women should avoid exposure entirely. If you have questions about the Safety Data Sheet (SDS) for any product, please contact our team for expert guidance.
Frequently Asked Questions about Hammertone Finishes
Can I apply PPG Hammertone directly to rust?
We get this question a lot at our Bayswater and Dandenong South locations. While you can apply some products like Galmet Rust Paint over light, stable rust, it is always better to treat it first.
For the best results, use a rust-repair system. This involves removing loose scale and applying a rust converter. If the surface isn't stable, the hammertone will eventually peel off as the rust continues to expand underneath.
Do I need a clear coat over a hammertone finish?
Generally, no. Hammertone is designed to be a topcoat. However, if the item will be subject to extreme UV exposure or chemical spills, a clear coat can add an extra layer of armour.
A product like Concept 1K Unique Clear Acrylic can provide extra gloss retention. Just ensure the hammertone is fully dry before applying the clear to avoid "lifting" the pattern.
How many colours are available in the PPG range?
The PPG range is extensive, featuring 49 curated colours. This includes everything from classic silver and charcoal to more vibrant industrial hues.
The Final Coat
At Eastern Auto Paints, we believe that the right information is just as important as the right paint. This PPG Hammertone Guide was designed to give you the confidence to tackle your next industrial or automotive project with professional-grade results.
With over 34 years of experience serving the Melbourne community from our bases in Bayswater and Dandenong South, we’ve seen the industry evolve. We combine that history with the latest in colour matching technology, utilised by our experienced professionals, to ensure our customers always get the perfect finish.
If you’re ready to start your project, you can purchase PPG Hammertone directly from our store. For more general information on our range of coatings, visit our auto paints page or get in touch with our expert staff for personalised advice. We’re here to help you get the job done right the first time.