If you’re thinking of refinishing your floors, concrete or any sealed surface, the first step is removing the old sealer. How to remove it without damaging anything? The challenge is to do it safely, properly and with an appropriate technique for the surface you’re working on.
You don’t have to be a pro in order to do it right. With the right tools, patience, and elbow grease, you can strip off old sealer and prepare your surface for a new finish.
Let’s go through it, step by step.
Know Your Sealer First
Determine what kind of sealer is still on the surface. What kind of finish is it? Solvent-based, water-based, acrylic, polyurethane? Each one acts differently, and some may require a specific removal method.
Here’s a quick way to test it:
- Put a few drops of xylene or acetone on the surface.
- Let it sit for 20–30 seconds.
- Wipe it with a cloth.
If it gets sticky or starts to soften, it’s probably a solvent-based sealer. Otherwise, you may have a tougher type like epoxy or polyurethane.
Select the Appropriate Removal Technique
And once you know what type you’re dealing with, opt for the most secure method.
Here are your main options:
- Chemical Strippers: If you are dealing with solvent-based sealers, they are an excellent choice. Be sure you’re using a product for your type of surface.
- Mechanical Removal: Sanding or grinding will remove tougher sealers such as epoxy or polyurethane. Be cautious with this, especially when working with decorative concrete.
- Pressure washing with hot water: A simple, powerful pressure wash may be enough for thin water-based sealers.
Work in Small Sections
Avoid rushing. Divide the project into smaller zones, so that you can focus on one area at a time. It gives you more control, and prevents uneven removal.
Be particularly careful when cleaning the epoxy resin floor. Epoxy is solid and dense, so it often requires mechanical grinding or a strong chemical remover. Just don’t go overboard, grinding deep could damage or scratch the floor.
Test Before You Go All In
As with all paint, always test a small area first before fully committing! That allows you to see how the surface responds and whether your chosen approach is practical. It can prevent you from more serious headaches down the line.
Each surface reacts differently (patios, garages, warehouses, etc.) If you plan to apply a coating like epoxy, the base must be clean and even.
Clean Up Properly
After you’ve removed the old sealer, the next step is to clean the area thoroughly. Leftover chemicals or dust from grinding will interfere with the new application. Clean the surface with a vacuum, mop, or pressure washer.
Allow the area to dry thoroughly before you apply a new finish. Moisture may be trapped beneath the new coating, causing bubbling or peeling. You do not want to do this job twice!
Tips to Keep Your Project Running Smoothly
Do not combine removal chemicals unless the label specifically states it is safe.
If you’re in doubt, consult with a local expert or the manufacturer. Neutralize chemical strippers and rinse per the manufacturer’s instructions.
Wrapping Up
Removing old sealers seems awful, but it can certainly be done. Preparation is key, especially when applying epoxy. Removing old paint, dirt, and grease will provide a fresh surface for your new coating to stick to. Set your own speed, accomplish the means, and you’ll be prepared to redesign your space, with no risks in question.
