How to Repair Acrylic Windows: Fixing Scratches, Haze, and Cracks

Acrylic windows are a popular choice for a variety of applications, from boat windshields to RV skylights. However, these transparent plastic panels can be susceptible to scratches, haze, and even small cracks over time. Fortunately, with the right techniques, you can often repair and restore acrylic windows to like-new condition.

Cleaning and Maintaining Acrylic Sheeting

Proper cleaning and maintenance are key to keeping acrylic windows looking their best. Avoid using harsh solvents or cleaners, as these can damage the surface. Instead, use a mild soap and water solution or a commercial plastic cleaner with a non-abrasive, lint-free cloth. For tougher grime, you can try using a small amount of hexane or kerosene, but be sure to thoroughly rinse and dry the surface afterward.

It’s also important to store acrylic in a cool, dry place away from direct sunlight, as extreme temperatures and UV exposure can cause the material to warp or become hazy over time.

Repairing Scratches and Haze

Minor scratches and haze can often be buffed out of acrylic using a plastic polish or car polish and a clean, soft cloth. Start with a coarser grit and gradually work your way up to finer polishes, taking care to remove any residual scratches from the previous step.

For more severe scratches or haze, you may need to use a random orbital sander or a rotary polisher to remove the damaged surface layer. Begin with a coarse 40-grit sandpaper and work your way up to finer grits, such as 60, 80, 120, and 180, before moving on to polishing.

It’s important to sand in a consistent, even pattern to avoid creating waves or distortions in the acrylic surface. Once the scratches and haze have been removed, you can finish with a high-quality plastic polish or automobile wax to restore the shine and clarity.

Repairing Cracks

Small cracks in acrylic can sometimes be repaired using a silicone sealant. First, use a 1/8-inch drill bit to create a hole on both sides of the crack, then fill the crack with a clear silicone sealant and allow it to dry. This can help restore the integrity and appearance of the acrylic, though it may not be a permanent solution for larger or more severe cracks.

For more significant cracks or damage, it may be necessary to replace the entire acrylic panel. Depending on the size and complexity of the window, this can be a relatively straightforward process, as acrylic is generally inexpensive and easy to work with.

With the right tools and techniques, you can often restore acrylic windows to their former glory, saving you the cost and hassle of replacement. By following these tips for cleaning, maintenance, and repair, you can keep your acrylic windows looking their best for years to come.