Rustoleum is a great type of paint - it provides a primer and finisher coat in one while also fighting against rust, peeling, cracking, and fading.
Different mixes can provide different finishes - metallic, glossy, glittering; there are plenty of options for any project!
But what about spraying on galvanised metal? Can the layer of zinc rich coating be disturbed with the multi-layered Rustoleum spray?
Follow this guide as we explore Rustoleum paint for galvanised metal and what types are best used for it.
Before we explore the different types of Rustoleum paint for galvanised metal, what exactly do both terms mean?
Originally, they used whale oil, but in 2022 that's a thing of the past. Instead, they use polyurethanes, epoxy paint, and latexes, to name a few, in order to enhance and create long-lasting paint.
Homeowners may decide to paint their metal decks outside, use on garage doors to spruce them up, or to add some color to their homes. It’s important that when you go to spray, you’re using the right tools on metal.
Using rust oleum Universal Paint and etching primer is not going to work - the zinc on the metal is going to reject the mix of primer and paint and will lead to peeling shortly after. Therefore, it's important to know what kind of paint you can use.
So, Can You Use Rustoleum Paint On Galvanized Steel?
The short answer: yes, with caution.
Galvanised metal is known to reject paints on its surface. That will be down to the layer of zinc, which will eventually lead to the peeling or cracking of paint. Acidic-based paints are going to speed up the corrosion, leading to rust. Oil-based are going to slip right off, and once dry, they’ll just peel.
The pure zinc coating provides maximum corrosion resistance and corrosion protection through galvanic protection and excellent adhesion and durability on the metal.
Along with excellent adhesion, it will also react with oxygen in the air to form zinc oxide and zinc carbonate.
What Types Of Paint Can You Use?
Ideally, you’re looking at using latex or acrylic-based paints for galvanised metal.
Using cold galvanizing compound spray paint on metal will simply thicken the layer of zinc. You can use galvanizing paint because it won’t do very much in the way of damaging the first layer.
If you’re attempting to re-galvanize, you should use primers and compound spray galvanizer on the metal rather than the paint.
We know what types of paint we can use, but as far as compound spray painting metal, is there a way to make it simple? Below is a simple guide on how to use rust oleum or Rustoleum on the metal.
How To Use Rustoleum Paint On Galvanised Metal
Before we start, you need to be using the correct paint - don’t use Alkyld-based spray paints. They won’t adhere to the surface and you'll waste your time. Instead, use acrylic latex paints that will easily stay on the metal. To paint your metal surface, follow this guide below:
- 1Clean and prepare the surface. You can use warm soapy water to clean off debris and dust with xylene or mineral spirits..
- 2Prepare the paint - if you’re using an HVLP system, you shouldn’t thin the paint, as it won’t adhere as well.
If you’re using cans or storage tanks, follow the instructions on the label.
- 3Spray! Apply one coat and wait about 15 minutes. You will need to do about 3 - 4 coats before it’s ready. Make sure it’s away from any objects that could cause issues; it takes roughly 7 days for the paint to cure.
- 4Apply a second coat, making sure there are no gaps or spaces on the surface.
- 5Allow the coats to dry before applying more. Once finished, set your galvanized steel aside in a cool, dry area to allow it to cure.
If it’s a garage door, you should not touch or use it until it’s fully cured.
It’s very important that you do not scrape old paint off of metal, as you run the risk of scratching the zinc layer.
To remove old paint, use isopropyl alcohol and rub it into the paint. Once thinned, scrub away with a sponge, or for tough paint, use a lacquer thinner.
Tips And Safety Guidelines
Using a spray can is the most effective way of using rust oleum or Rustoleum paint, but you should make sure it’s primed correctly by shaking it vigorously for 60 seconds. This removes any congealed paint and allows it to flow smoothly.
Don’t spray rust oleum closer than 8 inches to the metal. Aim to be about 16 inches away, using a back-and-forward motion to apply.
On the second coat, you should be careful not to overspray on one area, which can lead to peeling.
If you want to make sure the paint will adhere, vinegar will promote adhesion by reacting to the metal.
If the paint doesn’t adhere even after rubbing vinegar, you may need to re-galvanized surfaces. Using a cold galvanizing compound spray on the surface should be able to clear the issue up.
Rustoleum Spray Paint On Galvanized Metal FAQs
How long does a Rustoleum Spray paint take to dry on galvanized metal?
The coats of Rustoleum will usually dry within 15 minutes on galvanized metal. To fully cure and dry inside and out, you’re looking at about 7 days.
How long do Rustoleum Sprays last on galvanized metal?
Rustoleum paint on galvanized metal will last approximately 20-30 years. So if left undisturbed or with gentle use, you can expect your paint to last a few decades.
Do I need to prime galvanised steel when using Rustoleum Spray Paint?
You don’t necessarily need to prime the surface other than cleaning it. If you wish to prime a galvanised metal surface, use an acrylic-based primer for the first coat. Latex primer works just as well.
How much does Rustoleum Spray Paint cost?
A can of Rust-Oleum spray paint can range from $5 - $16. For paints in an HVLP system, the price could rise to $30.
Galvanised metal has always been tricky to paint. But knowing what types of paint to use and how to correctly spray will save you time and energy in the future.
Touching up your galvanized metal isn’t as difficult as you think, and now you can go forward with your DIY projects!