FRP Wall Panel Install Guide

Top 5 Mistakes to Avoid When Installing FRP Wall Panels

Fiberglass Reinforced Plastic (FRP) wall panels are a trusted choice for commercial kitchens, bathrooms, warehouses, and countless other settings thanks to their durability, moisture resistance, and easy maintenance. However, even the best FRP panels can underperform or fail if installed incorrectly.

At Canada Plastics & Belting Inc., we want your project to be a long-term success—so we’ve compiled the top five FRP wall panel installation mistakes and how to avoid them. Read on to ensure your next installation is smooth, professional, and built to last.

Skipping Proper Wall Preparation

Why it’s a problem:
FRP panels rely on a strong bond with the wall substrate. If the wall is dirty, uneven, damp, or covered in loose paint, the adhesive won’t stick properly. This can lead to bubbling, warping, or panels peeling away over time.

Common pitfalls:

Installing over dust, dirt, or grease.
Ignoring high or low spots, rough patches, or warped drywall/plywood.
Applying panels to wet or uncured surfaces.

How to avoid it:
Always start by thoroughly cleaning the wall. Remove dust, grease, and any loose paint. Sand down high spots and fill in low spots to create a flat, even surface. Make sure the wall is completely dry—moisture is the enemy of good adhesion. If you’re installing over painted surfaces, lightly abrade or perforate the paint to help the adhesive grip better.

Pro tip:
Don’t rush this step! Proper prep work saves headaches later and ensures your panels stay put for years.

Using the Wrong Adhesive or Application Method

Why it’s a problem:
Not all adhesives are compatible with FRP panels or your specific wall surface. Using the wrong type can result in weak bonds, bubbling, or even total panel failure. Likewise, improper trowel size or technique can leave bare spots or create drag marks that compromise adhesion.

Common pitfalls:

Using generic adhesives instead of FRP-specific ones.
Not checking adhesive compatibility with the substrate.
Applying adhesive to the wall instead of the back of the panel.
Using the wrong trowel notch size or pattern.
Applying too much or too little adhesive.

How to avoid it:
Always use adhesives formulated for FRP, and follow the manufacturer’s instructions to the letter. Apply adhesive to the back of the panel (not the wall) using the recommended trowel and ensure full, even coverage. A crosshatch pattern is often best for maximum grip. Never “eyeball” it—measure and check as you go. Contact

Pro tip:
If you’re unsure which adhesive or trowel to use, ask your supplier for guidance. We’re always here to help you choose the right products for your project.

Neglecting Expansion Gaps and Oversized Holes

Why it’s a problem:
FRP panels expand and contract with temperature and humidity changes. If they’re installed too tightly against each other, or if holes for fasteners and pipes are too small, the panels can buckle, bulge, or crack as they move.

Common pitfalls:

Butt-jointing panels without leaving a gap.
Drilling holes that fit fasteners or pipes too snugly.
Installing base or cove molding that restricts panel movement.
Adding tile or fixtures over the panel after installation, restricting expansion.

How to avoid it:
Always leave a small gap (usually 1/8″ to 1/4″) between panels and at the top and bottom for expansion and contraction. When drilling holes for fasteners, pipes, or conduits, make them slightly larger than the object passing through—this allows for panel movement without stress points. Don’t install molding or fixtures so tightly that they “pin” the panel in place.

Pro tip:
If you’re unsure how much space to leave, check the manufacturer’s installation guide or consult with our team for best practices.

Improper Fastening Techniques

Why it’s a problem:
Fasteners that are too tight, too close to the edge, or not spaced properly can cause cracks, uneven surfaces, or poor structural integrity. Skipping pre-drilling or using the wrong type of fastener can also damage the panel.

Common pitfalls:

Using fasteners without pre-drilling oversized holes.
Placing fasteners too close to panel edges.
Over-tightening screws or rivets.
Using fasteners that aren’t corrosion-resistant.
Not using enough fasteners, leading to loose or sagging panels.

How to avoid it:
Always pre-drill holes for fasteners, making them slightly larger than the fastener itself to allow for panel movement. Use corrosion-resistant fasteners (like nylon rivets or stainless screws) and follow the manufacturer’s recommended spacing—typically every 16″ on center, with outer fasteners about 1″ from the panel edge. Don’t over-tighten; fasteners should be snug but not so tight they deform the panel.

Pro tip:
Use protective caps for a clean, finished look and added moisture protection.

Failing to Roll or Press Panels Properly

Why it’s a problem:
Even if you use the right adhesive and prep the wall perfectly, air bubbles or poor contact between the panel and substrate can lead to adhesion failure, bubbling, or warping.

Common pitfalls:

Pressing panels by hand only, missing spots.
Not using a roller to eliminate air pockets.
Rushing the process, especially on large panels.

How to avoid it:
After positioning the panel, use a laminate roller (or J-roller) to press the entire surface firmly against the wall. Start at the top corner and work your way down and outward, ensuring 100% contact and pushing out any trapped air. Pay extra attention to panel edges, corners, and around holes or cutouts. Don’t skip this step—it’s essential for a strong, lasting bond.

Pro tip:
Have a second person help with large panels to keep everything aligned and pressed evenly.

Bonus: Don’t Forget Sealing and Finishing Touches

After installation, seal all seams, edges, and holes with a compatible sealant to prevent moisture intrusion and maintain hygiene. Trim excess material for a neat finish. If you’re using base or cove molding, make sure it doesn’t restrict panel movement. Final details matter for both performance and appearance.

The Takeaway: Install FRP Panels Like a Pro

Avoiding these five common mistakes will help you achieve a flawless, long-lasting FRP wall panel installation. At Canada Plastics & Belting Inc., we’re committed to helping you succeed at every step—from choosing the right materials and adhesives to providing expert installation advice. If you have any questions or need product recommendations, don’t hesitate to reach out or explore our FRP Wall Panels page.

View our FRP Wall Panels Installation Instructions PDF for more information.

Choose quality, follow best practices, and your FRP panels will deliver years of reliable, attractive performance. Contact us if you have any questions, or want to place an order.