hey i got a problem here, after i sand my plastic model using 220w n 320w , it leave scatches , and i used 2000p or other smoother sand paper to smooth it out. but after i have done that , there is still scatches on my plastic model, it ther anyway to compeltely removing it leaving no scatches at all beside painting it. any good way to remove it? plz help. thanks
I think it’s too big of a jump going straight from 320 to 2000 grit. The 2000 can’t smooth out the scratches left by the 320.
After you do the heavy sanding, try 600 and 800, then polish it up with the 2000.
That oughta do it!
You can also minimize scratches in any grit by wetting the surface. Also, after blend sanding, a coat of Mister Surfacer does wonders !
Steve
i have try it, but there is still a bit of scatches after i apply future on it. think there is no others way beside painting it.
To me, 220 is awfully harsh (unless you’re doing a significant amount of plastic removal). I usually starty w/360 followed by 400, then 600 and if needed 800. If you’re looking for a glass smooth finish, continue to sand in increasingly finer grades. Do all your sanding wet.
Then I reckon you will just have to try a little bit harder! [;)]
All the methods posted here will work if you are patient. You have to sand thoroughly with the gradually lighter grits to eliminate scratches that would be visible through the paint.
If you take your time, are patient, and sand thoroughly, you should be pleased with the results you’ll get.
Good luck!
ok think that 320 grit n 400 grit shld be enough n it must take time n keep sanding until no scathec, thanks a lot
Me too… I’m very happy with 400 grit sandpaper. I hardly ever use anything with higher grit, unless I’m sanding the canopy, at which time I will use 1200, 1500, and 2000 grit. But right now, for the rest of the plane, I’m only using 400 grit.
I am curious, you mentioned that even after applying Future the scratches where still visible and painting might be the only way to cover the scratches left from sanding.
Are you trying to “avoid” painting the plastic?
If so, then are you looking to buff the sanding marks out of the plastic so you can “just” clear coat it?
If you are looking to prep the plastic for removal of any sanding scratches that “won’t” show through a paint job, then wet sand and primer.
Usually wet sanding with progressively finer grits until 800 or even 1200 should be more than adequate. Try wet sanding either under running water or add a little dish soap to your bucket of water and make sure to keep the plastic and sand paper dripping wet while sanding. You don’t want the sand paper to clog up, then it will start to make deep cuts as the plastic is reforming on the paper.
When done sanding, give a few coats of primer paint. When dry, wet it down with water and see if any scratch marks are noticable. If not, give it a very light wet sand with 800 - 1200 grit. Now you’re ready for the painting process.