Marine Plastic  Reconditioning Systems

Restore the clarity of acrylic and polycarbonate plastic parts such as boat windshields, port-lites and hatch covers with 3M Plastic Reconditioning Systems, The 3M Plastic Reconditioning System Charts will assist you in determining which procedure and products you need for your plastic reconditioning project.
Prior to the start of your plastic reconditioning project, refer to the following helpful hints.
Plastic Identification
Acrylic Plastic,
(Plexiglas, Acrylite, etc.)
Because acrylic plastic has a greater surface hardness than polycarbonate plastic a simple scratch test can be performed. Find an inconspicuous area of the plastic part, (i.e. corner of a windshield, area underneath a removable trim piece), where a scratch can be put into the plastic without it being noticed. Use a sharp instrument, like the blade of a screwdriver and run the corner of the blade across the plastic. If you hear a scraping sound and/or feel the blade jump across the surface, you are working on acrylic plastic.

Polycarbonic Plastic
(Lexan: Tuffak, etc.)
For testing the surface of polycarbonate plastic use the same scratch test as for acrylic plastic. If no sound is heard while scraping and/or the blade of the screwdriver moves smoothly across the surface. (denting the surface instead of scraping) you are working on polycarbonate plastic.
Polycarbonic Plastic Repair
Machine Glazing, periodically, will keep the finish in top shape. If a light scratch should occur, wet sanding with Micro Fine 1200 grit could be utilized. (Wet sanding tips below) Always have a good flow of water to help reduce clotting of the abrasive, which could actually leave the surface scratchier than anticipated.  Then proceed with the machine  compounding and then machine glazing.

Warning: Never use heavier than 1200 grit wet abrasive on
                Polycarbonic Plastic. It is doubtful you will
               ever get a like new finish if the scratch needs
               more than 1200 grit.

Acrylic Plastic Repair
Here again machine glazing periodically should maintain the finish. If a small or large scratch should occur abrasives in the 600 to 320 could be utilized. Always start with the lightest that you think you will need. No sense in working more than you need to. (See sanding tips below.) Then progress to the finer grades in steps. The more steps the better and always keep the water flowing. Then machine compound and machine glaze to finish the job.

Cross-Sanding Definition
Cross-sanding is the technique of ensuring the removal of a coarse scratch by sanding perpendicular to the coarse scratch with a finer grade abrasive until all the sand scratches are in the same direction as the finer abrasive scratch. Cross-sanding will allow you to see any of the coarser sand scratches you may have missed while sanding with the finer grade abrasive prior to the compounding step.

1) After Determining the type of plastic you are working on, begin wet sanding with the recommended abrasive in one direction only. Refer to the list for abrasive grade.

2) Wet sand the entire area making sure all the sanding scratches are going in the same direction. The finish area should look like the illustration left.

3) Now using a finer grade abrasive, wet sand in a perpendicular direction of the previous step until all the coarser scratches have been eliminated. This is the trick for good results.

4) After the two or three sanding steps are completed, the area should look like the illustration. Compound and machine glaze using the recommended products in the list.

Note: Hand compounding can be added as an extra step, but hand compounding and hand glazing won't result in a satisfactory finish. You need to use a power buffer.

3M Preferred Marine Acrylic Plastic Reconditioning System
For PlexiglasTM AcryliteTM LuciteTM etc. Windshields and other acrylic plastic parts.
For compounding use Superbuff TM 2 plus 2 Pad (Pad No 05701) or HookitTm SBSTm Compounding Pad (Pad No 05711) For machine glazing use 3M Perfect-itTM Foam Polishing Pad (Pad No, 057251.)

NOTE: The SupebuffTM 2 plus 2 Pad and Superbutf " Polishing Pad must be used with the SuperbuffTM Adapter (part No 05710). HookitT' SBStm Compounding and Polishing Pads must be used with the HookitTM sBs" Backup Pad (Pad No, 05717). The Perfect-it'" Foam Polishing Pad must be used with the Perfect-it' Backup Pad (Pad No. 05718) or HookitTM SBSTH Backup Pad (Part No 05717).

3M Preferred Marine Polycarbonate Plastic Reconditioning System
For LexanTM TuffakTM etc. Windshields and other polycarbonate plastic parts. For compounding. use SuperbuffTM 2 plus 2 Pad(part No 05701) or Hookit tm SBS'TM l:compounding Pad (Pad No, 05711) For machine glazing use 3M Perfect-it"tm Foam Polishing Pad (Pad No, 05725).

NOTE: The SuperbuffT" 2 plus 2 Pad and Superbuff'tm Polishing Pad must be used with the SuperbuffTM Adapter (Part No, 05710). HookitTm SBStm Compounding and Polishing Pads must be used with the HookitTm SBStm Backup Pad (Part No 05717). The Perfect-it tm Foam Polishing Pad must be used with the Perfect-it TM Backup Pad (Part No. 05718) or Hookit'* SBS tm Backup Pad (Part No. 05717).

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