Top 5 Surface Prep Mistakes: Are You Making Them?

Common Question: "Why does my coating keep peeling off after just a few months? What went wrong?"

Key Points to Keep in Mind:

• Skipping moisture tests can lead to adhesion issues.
• Choosing the wrong prep method for the surface can cause coating failure.
• Always clean the surface thoroughly before applying coatings.
• Temperature and humidity matter when applying coatings.
• Don’t rush through the process—patience pays off!

Surface prep is often the most critical part of a coating job, yet it’s frequently the most neglected or rushed step. Many applicators face a common dilemma: Why does my coating peel or fail? While it’s tempting to think the problem lies in the coating itself, it’s often a result of improper surface preparation. In this blog post, we’ll go over the top five mistakes that can ruin your project and how to avoid them.

You may think you’re ready to apply a new coating, but without proper surface prep, the coating won’t adhere properly, and you’ll be left dealing with costly rework. Below are the top five mistakes, common questions, and expert tips to help you avoid them.

1. Skipping the Moisture Test

The Mistake: Not checking the moisture levels in concrete before applying coatings.

Why It’s a Problem: Moisture trapped in the concrete can cause bubbling or peeling, leading to an uneven and unreliable finish. Concrete that seems dry could still be holding moisture under the surface, which can ruin the integrity of your coating.

How to Avoid It: Always conduct a moisture test using reliable methods such as calcium chloride or relative humidity (RH) testing. You can also use moisture barrier primers designed to handle high moisture content. If you want to be sure, consult with a professional or PowerCOAT Canada to guide you.

2. Using the Wrong Prep Method

The Mistake: Choosing the wrong surface prep method for your project.

Why It’s a Problem: Not all prep methods are suitable for every surface. Using acid etching on concrete when mechanical grinding is needed, for example, can lead to improper bonding, resulting in a coating that doesn’t last.

How to Avoid It: Each surface is different, and each coating requires a specific preparation technique. For most coatings, mechanical grinding or shot blasting is the best way to profile the surface. PowerCOAT Canada offers professional-grade equipment and training to help you get it right every time.

3. Not Cleaning the Surface Thoroughly

The Mistake: Not properly cleaning the surface before applying your coating.

Why It’s a Problem: Oils, dirt, and dust can prevent your coating from adhering properly. Even minor contaminants can cause bubbles, fisheyes, and peeling.

How to Avoid It: After grinding or blasting, always vacuum the surface thoroughly. Use a degreaser to remove oils and contaminants, and wipe it down with a tack cloth to remove fine dust. Make sure the surface is spotless before proceeding to the next step.

4. Ignoring Temperature and Humidity

The Mistake: Applying coatings in unfavorable weather conditions.

Why It’s a Problem: Most coatings have a specific temperature and humidity range for application. If the temperature is too low or the humidity is too high, the coating may not cure properly, leading to failure.

How to Avoid It: Always check the manufacturer’s recommendations for temperature and humidity ranges. In extreme weather, consider adjusting your application schedule or using coatings designed for a wider range of conditions.

5. Rushing the Process

The Mistake: Trying to cut corners by skipping curing times or re-coating too soon.

Why It’s a Problem: Hurrying through the process can result in inadequate adhesion, leading to coating failures. Proper curing times and recoat windows ensure that your coating bonds properly and performs as expected.

How to Avoid It: Patience is essential. Follow product guidelines for curing times, and don’t rush through the steps. Make sure each layer is fully cured before moving to the next.

FAQs – Common Questions About Surface Prep

• Q: How do I know if the surface is clean enough?

A: You should be able to run your hand over the surface without feeling dust, grease, or contaminants. If in doubt, clean it again with a degreaser or solvent.

• Q: Can I apply coatings during the winter?

A: Yes, but you need to monitor temperature and humidity carefully. Coatings like polyaspartics may work in cooler temperatures, but always check the product’s data sheet for the correct application range.

• Q: Should I always use a moisture barrier primer?

A: If you suspect there may be high moisture in the concrete or the surface has been exposed to high humidity, a moisture barrier primer is highly recommended to ensure adhesion.

• Q: What if I don’t have a grinder or shot blaster?

A: PowerCOAT Canada offers rental equipment, and we can guide you on the best machines for your project needs.

• Q: What’s the best way to avoid peeling or bubbling after applying coatings?

A: Proper surface prep, including moisture testing, mechanical profiling, and cleaning, is the best way to avoid these issues. Always make sure the surface is fully prepared and that curing times are respected.

Ready to Get Started?

Don't let surface prep mistakes hold you back! At PowerCOAT Canada, we provide the products and equipment you need to get your coatings right the first time. Whether you're prepping a residential floor or a commercial space, we have everything you need to ensure a long-lasting, high-quality finish.

Shop Now for top-quality coatings, surface prep equipment, and more at PowerCOAT Canada. Get in touch with us today to learn how we can help you achieve the best results every time.