Woodworking Talk - Woodworkers Forum

Woodworking Talk - Woodworkers Forum (https://www.woodworkingtalk.com/forum.php)
-   Wood Finishing (https://www.woodworkingtalk.com/f8/)
-   -   Im on a sanding loop and cant get out! (https://www.woodworkingtalk.com/f8/im-sanding-loop-cant-get-out-213271/)

soundmun 06-25-2019 11:50 PM

Im on a sanding loop and cant get out!
 
3 Attachment(s)
This done on the lathe 500-800 rpm.
Steps:
Wet sanded to 2000 grit.
Then mcguiars ultimate compound with soft shop towel
2x scratch remover
finished with finishing soft pad using mcguiars unltimate polish.
all finishing steps were about 1 min on the lathe.

What am I doing wrong ? are those scratches from the sadning or from the compound?
What step should I return to?

Steve Neul 06-26-2019 12:01 AM

You need to upload the pictures. Unless you are a member of photobox you can't see the pictures.

What kind of finish do you have on the turning and how did you apply it?

You say you sanded to 2000 grit but what grit did you start at? Even starting at 600 grit it would take a lot of sanding to remove the scratches made by the paper.

soundmun 06-26-2019 12:08 AM

Well I started with 220 ...

Steve Neul 06-26-2019 09:20 AM

The 220 was the problem then. 220 is alright if you were going to put another coat on but to rub it out is very coarse. Normally when you rub out a finish 1200 grit is the very coarsest grit you want to use. Even then it takes a lot of elbow grease to polish out the finish from there.

Tony B 06-26-2019 12:09 PM

If you started with 220, you probably should have started with around 100 and progressed upward.
Your first grit is the most important. If you start with say 100 grit. keep on it until all imperfections are gone. Then gradually progress with 120, 150, 180, 220, 400, etc. Each grit is removing the grit scratches before it. If you skip a grit size, you will have to spend more time with the higher grit to cut down past the size you skipped. This is not very efficient with either your time or your sandpaper.

soundmun 06-26-2019 03:43 PM

Thank you guys the elaborated info,
the finish is ...crystal clear epoxy. ( it is also the body as the wood was submerged to the clear resin )
So go back to sanding I guess, But at which grit to start now from?

Steve Neul 06-26-2019 04:07 PM

Difficult to say without seeing it first hand. Also epoxy will be that much harder to sand. Best guess would be to start somewhere half way, maybe 1200 grit. Sand it until the paper is worn out and get another piece of 1200 and do it again before proceeding. Use water as a lubricant to make the paper more effective.

soundmun 06-26-2019 10:51 PM

Quote:

Originally Posted by Steve Neul (Post 2060515)
Difficult to say without seeing it first hand. Also epoxy will be that much harder to sand. Best guess would be to start somewhere half way, maybe 1200 grit. Sand it until the paper is worn out and get another piece of 1200 and do it again before proceeding. Use water as a lubricant to make the paper more effective.

I know it will be harder but when it gets to the point it shines, is shines like a diamond :)
Thanks alot.

soundmun 06-26-2019 11:56 PM

Quote:

Originally Posted by Steve Neul (Post 2060439)
The 220 was the problem then. 220 is alright if you were going to put another coat on but to rub it out is very coarse. Normally when you rub out a finish 1200 grit is the very coarsest grit you want to use. Even then it takes a lot of elbow grease to polish out the finish from there.

Before I start resanding at 1-1.2K grit, whould you suggest random orital sander or keep sanding on the lathe?
The circle scratches pattern are obviously from the lathe so im thinking will higher grits remove this circles till is too small to be visible or ro orbital sander to 2.5 K ?

Tony B 06-27-2019 08:44 AM

Since we cant see what you did, it is hard to give advice. Meaning , maybe the scratch marks you are see should have been removed with a coarser grit than 220. See my post number 5.

If you are looking for a short cut, there isn't any that can be recommended unless we are actually there to see it up close. I suggest you start all over again with 100 grit and stay on it until all defects are sanded out. Then progress onward. One minute on each grit may not be long enough. You will have to look at each stage to see if the previous stage of grit is all sanded out. It's a very simple process.

Also, don't be cheap with the sandpaper. You may not be changing it out often enough. If the sandpaper feels dull, change it.

Steve Neul 06-27-2019 09:01 AM

Quote:

Originally Posted by soundmun (Post 2060555)
Before I start resanding at 1-1.2K grit, whould you suggest random orital sander or keep sanding on the lathe?
The circle scratches pattern are obviously from the lathe so im thinking will higher grits remove this circles till is too small to be visible or ro orbital sander to 2.5 K ?

I was under the impression the problem was from between the coats sanding. To suggest using an orbital sounds like the scratches are in the wood. Either way sanding on the lathe would be the preferred choice. An orbital will make flat spots on the turning which will show up in the finish. The lathe will maintain the rounded surfaces.

From the picture in post one it appears the wood wasn't sanded enough before finishing. You might be able to level the surface with more epoxy but I think it would be easier to sand it to bare wood and start over.

soundmun 06-27-2019 11:35 AM

2 Attachment(s)
thats weird i uploaded the images and it was shown before. Ill upload again


All times are GMT -4. The time now is 01:13 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

 
For the best viewing experience please update your browser to Google Chrome