Polymethyl methacrylate is generic for Plexiglas and other brands. This acrylic is tough, flexible and transparent. It makes an ideal material for boat windshields but scratches easily. With proper maintenance, and with these products, you can remove lighter scratches. Here’s how we tested them to see how they compare.
How We Tested
Testing Two Levels of Abrasion
To simulate everyday wear we rubbed a dry terry towel over an acrylic panel until fine marks appeared and then used the polish portion first.
To test our products on light scratching, we abraded our test panels with 600-grit paper and completed the entire directions process of each kit or product.
For test purposes, we keyed on only acrylic panels. Polycarbonate is sometimes used for boat windshields, but it comes with a warning that coatings on it can be damaged or destroyed by some restoration products.
1 = Abrasion not resolved
2 = Abrasion partially resolved
3 = Abrasion mostly resolved
4 = Abrasion perfectly resolved
3M Headlight Restoration System and Finesse-It II
Kit: $17.97, Finesse-It II: $24.99; jamestowndistributors.com
Main Customer: Automotive
Description: The included drill-mounting buffer pad has a Velcro surface that accepts progressively finer grit sanding pads. Afterward, use the foam polish pad and the packet of polishing compound to finish the job.
Test Notes: Finesse-It II did the best job of removing terry scratches in one pass. For the 600-grit scratch test, the kit was the most aggressive and effective system tested. But it’s the last resort before windshield replacement. Everything you need but a power drill is in the kit. The mohair foam pad was gentle and thorough in the final polish.
Final Note: You may need two kits for larger windshields, but we used only a minute fraction of the supplies on our test patch.