Nope, it is a surface treatment only. Deep crazing won't be affected. Novus #2 is specifically designed for acrylics and polycarbonates and costs much less than the proprietary "headlight polishes". I use it regularly to remove surface scratching and hazing from portlights and Lexan dodger windows.
If you have deeper scratches, you can use Novus #3, but if you use it too hard you can create "lensing" on the plastic. Jim Watts Paradigm Shift C&C 35 Mk III Victoria, BC On 12 May 2017 at 08:24, Harvey Barth via CnC-List <cnc-list@cnc-list.com> wrote: > Will this process work to remove the crazing and small cracks that appear > on older hatches? > Harvey > > Sent from my iPhone > > On May 12, 2017, at 9:35 AM, Larry via CnC-List <cnc-list@cnc-list.com> > wrote: > > Bruce > > You are doing it correctly. I have worked with “Plexiglass” since the > early 70’s. However you only want to use the least grit paper to get the > scratches out, so as to remove the minimum amount of material. I usually > start with 1000 or 800 grit to determine if the scratches will come out. I > then use 1200, 1500, 2000, 2500, 3000, 4000, and 5000 grit before moving on > to polishing. Then you want to use a cloth that is safe for eyeglasses. I > have done this many times on motorcycle windscreens and aircraft > windscreens. I did it ones on my boat. Now I just take plexiglass polish > three times a year to it. > > Good luck > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com > <cnc-list-boun...@cnc-list.com>] *On Behalf Of *Bruce Whitmore via > CnC-List > *Sent:* Thursday, May 11, 2017 7:01 PM > *To:* C&C List > *Cc:* Bruce Whitmore > *Subject:* Stus-List Fogged, Scratched Plexiglass - Good home test, now > to try it on our companionway hatches... > > > > Hello all, > > > > Our 37/40+ has tinted plexiglass sliding companionway hatches that look > fogged and lightly scratched all over from years of sun. After reading > here and other places about potential ways of curing the issue, I ran a > test here at home. I have a Ryobi Corner Cat, and grabbed a piece of scrap > plexiglass. Starting with 360 wet/dry sandpaper, I wet sanded the nice new > piece of plexi until it looked like $#!+. Then followed with 600, 1200 and > 2000, then went to buffing compound, and finally to McGuire's polish for > headlights. > > > > Sure enough, the piece of plexiglass came out really nice & clear. > > > > So, I think I'll try it on the sliding hatchboards unless someone here > cautions me otherwise. > > > > What say you wise folks? > > > > Bruce Whitmore > > (847) 404-5092 (mobile) > bwhitm...@sbcglobal.net > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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