Universal Undercoat: The Foundation for a Flawless Finish

If you're prepping surfaces for painting—whether it's wood, metal, or previously painted walls—a universal undercoat is your secret weapon for achieving a smooth, durable, and professional-looking result. Designed to work under a wide range of topcoats, this versatile product bridges the gap between primer and final paint, improving adhesion, masking imperfections, and enhancing color uniformity. Universal Undercoat Excelsior 500ml

What Is Universal Undercoat?

Universal undercoat is a solvent-based or alkyd-based intermediate layer applied after priming and before the final coat of paint. It’s formulated to:

• Improve adhesion between primer and topcoat
• Provide a smooth, sandable surface
• Enhance gloss holdout and color depth
• Mask minor surface imperfections
• Work with both water-based and solvent-based paints

It’s suitable for interior and exterior use on properly primed wood, metal, plaster, and hardboard.

Where and When to Use It

You’ll want to use universal undercoat when:

• Painting over enamel and switching to acrylic topcoats
• Preparing metal or wood surfaces for high-gloss finishes
• Covering old paint with a new color
• Ensuring uniform absorption on porous substrates
• Creating a stable base for decorative finishes

It’s especially helpful in renovations or when transitioning between different paint systems.

Application Tips

To get the best results:

1. Surface Prep: Clean, dry, and prime the surface first
2. Stir Thoroughly: Mix the undercoat well before use
3. Apply Evenly: Use a brush, roller, or spray
4. Drying Time: Allow 4–16 hours depending on product and conditions
5. Sand Smooth: Lightly sand before applying the topcoat
6. Ventilation: Ensure good airflow during application and drying

Avoid applying in wet conditions or on masonry unless specified by the manufacturer.

Maintenance and Safety

• Clean tools with mineral turpentine
• Store in a cool, dry place
• Keep away from heat and open flames
• Wear gloves, goggles, and a mask during use
• Keep out of reach of children and pets

Always follow the product’s safety datasheet for full handling instructions.

Where to Buy in South Africa

You can find universal undercoat at Construction Hyper and other local retailers.  

Universal Undercoat Excelsior 500ml

Universal Undercoat Excelsior 1L EXCUUC1

FAQs

Can I use universal undercoat on masonry?
Not recommended unless specified—check the label for substrate compatibility.

Does it work with water-based topcoats?
Yes, it’s designed to bridge solvent-based and water-based systems.

Can I tint universal undercoat?
Some brands offer tinting to pastel shades—ask your supplier.

Final Thoughts

Universal undercoat is more than just a middle layer—it’s the key to a long-lasting, professional finish. Whether you're painting a door frame, prepping a metal railing, or refreshing a wall, this product helps your topcoat shine while protecting the surface beneath. Choose wisely, apply carefully, and enjoy the transformation.