How can i repair scratches on a plastic caravan window
Plastic polish comes in a variety of grits to help buff out scratches in a wide variety of plastics. Novus is a popular brand; their stuff comes in 3 grades: #1 for very fine scratches, #2 for moderate scratches, and #3 for deep / rugged scratches. I generally use #2 polish; #3 polish leaves smaller scratches behind that must be buffed out using #2 polish. Auto repair shops also sell plastic polishes. You might also be able to use automotive rubbing compound, if you don't have access to plastic polish. In a pinch, you can also use traditional white toothpaste, as it contains mild grit (that's how your teeth get polished, after all). Note that toothpaste may also leave behind small scratches.
In terms of hardware, some people use a rotary buffer (like you'd use with car wax) to apply the polishing compound. I have tended to leave swirl marks when I use one. Some people use a Dremel rotary tool, but the super-fast rotational speed can melt/burn the plastic if you apply too much pressure. I prefer to use a soft, all-cotton cloth (an old washcloth or tube sock turned inside out works well), with a dab of polish on it. For straight line linear scratches, I generally run the polish along the scratch to lift out any paint, etc, and to soften the walls of the scratch. This alone usually makes the scratch a lot less visible. However, to finish the buffing, it's good to polish in a circular motion to feather the areas immediately surrounding the scratch into the scratch area.
Some plastics are tougher to polish than others. Super-hardened plastics and some polycarbonates will not clear up using these methods. Most, however, will at least look better after you've done a bit of polishing, even if the scratches don't completely disappear.
May 11, 2011 |