I have a plexiglass window that is surrounding a window air conditioner.

There are a few scratches in it.

I watched a video on youtube where they instructed to wet sand with 600 grit and rubbing compound.

I do not have rubbing compound and am not sure if I should especially buy it for one PG window.

Is there a cheap way to buff out these scratches? Toothpaste? I know it's used to clean up car headlights.

I want this plexiglass to last for a long time.

Thank you and have a great day!

EDIT I have scratches NOT CRACKS!!

  • 2
    Cracks are not scratches. Scratches are not cracks. Please revise your post to be clear about which you're dealing with and only mention that. – isherwood Apr 28 at 18:12
  • 1
    Scratches might buff out. Cracks will need to be glued which may or may not result in an invisible repair. – FreeMan Apr 28 at 18:23
  • 600 grit will not give you a clear finish. It will be cloudy at best. – spuck Apr 28 at 19:18
  • Your question is similar to saying I want to go 0 to 60 in 3 seconds but my moped motor is all I can use. If you don’t want to get a buffing compound try toothpaste, I bought one of those head light buffing kits for under 10$ that may work. – Ed Beal Apr 28 at 22:59
  • you need many grits. the lowest should about match the width of the scratches and happens first. toothpaste is closer to step 3/4. My improvised grit ladder: [popcorn salt+oil > wet charcoal > toothpaste > chalk]... – dandavis Apr 29 at 4:04

Some people will run a very low temp blowtorch or heat gun across it. Supposedly this melts high spots and makes it clearer. It can also burn, so YMMV.

  • 1
    1 mm thick acrylic will nearly instantly bubble and melt, from experience. 3 mm thick material, not so much. – fred_dot_u Apr 28 at 19:15
  • 1
    I don't think anyone actually uses 1mm around ac units... seems too likely to flex/break. – gbronner Apr 28 at 19:35
  • The plastic shop I worked in used acrylic solvent to weld plexiglass although it has to be able to get in a crack to make the bond. They flame polished some of the cut edges with hydrogen/ oxygen no black residue but will bubble quickly and makes nasty blisters as the flame is so clean it’s hard to see. – Ed Beal Apr 28 at 19:39

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