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Old 11-28-2018, 10:03 PM   #1 (permalink)
 
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Default Micro ridges after finishing

After turning a pen I sand to a 400 grit Abranet. I cross sand and then apply Mylandís sanding sealer. I then use a clean cotton t-shirt to apply Mylandís friction polish. Once the pen gets hot and I get the high sheen I like there are oftentimes small micro ridges on the pen. These are not present after turning just after finishing. I have tried blue paper towel. The ridges are more obvious on darker woods. I do not have a variable speed lathe and finishing is done at the same RPMís as turning. These ridges really bug me. Any ideas or different techniques that I should try?


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Old 11-28-2018, 10:32 PM   #2 (permalink)
 
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I've never used the friction polish but I would think that if you are applying any finish at high speeds, it's not letting the finish settle. Its like spilling water on the counter and blowing on it. It makes waves.
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Old 11-28-2018, 11:02 PM   #3 (permalink)
 
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Have you tried a higher grit? I dont stop until 12000 micromesh myself
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Old 11-28-2018, 11:06 PM   #4 (permalink)
 
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A high gloss finish can magnify tool or sanding marks . Check your ready to finish pieces under a low angle of incidence light source , preferably daylight , not one directly over the piece .
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Old 11-28-2018, 11:08 PM   #5 (permalink)
 
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I don't know about your ridges, but DON'T use a T-shirt. That is very dangerous.
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Old 11-28-2018, 11:57 PM   #6 (permalink)
 
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Why do you stop at 400 grit, I never stop sanding until I get up to at least 6000 micro mesh. And then, I only stop if I'm satisfied with how the finish looks. If there is any signs of micro scratches at 6000, I sand on up higher until there is none.

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Old 11-29-2018, 07:00 AM   #7 (permalink)
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A few others have mentioned this in the past year or so.

Ridges - are they being formed AFTER sanding? Or do you not use a skew/scraper to smooth out the CA/finish after applying it?

I ALWAYS use my scraper to smooth out ridges, waves, imperfections BEFORE sanding, or in some cases polishing. When using my scraper, I don't always need to sand, so I go into the polishing mode.

There are applicators that will smooth out the CA finish much better than paper towel and in general prevent most ridges from occurring.
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Old 11-29-2018, 08:05 AM   #8 (permalink)
 
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I am certainly no authority, but after a sanding sealer, I hit it again with the last grit I used... repeat sealer and sand again (both ways)... I go to 800 on a wood pen

You're gonna get 3000 other replies, but eventually you need to experiment and find what works for you!
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Old 11-29-2018, 08:53 AM   #9 (permalink)
 
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FWIW, I found that I was taking too long to apply CA to the wood blank. This resulted in the CA setting up while applying and looking like my dogs chewed on it. I apply thin Ca with a paper towel while turning the lathe by hand- left hand turns and the right hand applies the CA. I marked the hex nut on the mandrel with a Sharpie and turn the lathe twice and no more. CA looks 1,000% better now. BTW, using cloth with a turning machine of any kind is dangerous.
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Old 11-29-2018, 09:41 AM   #10 (permalink)
 
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Many are responding to CA finish even though the OP is using a friction finish.

Sand to a higher grit. Also, friction finishes should be applied at a high speed. You can wipe it on with the lathe off then at the highest speed your lathe has rub it in using paper towel folded over several times. You should feel the heat through the paper towel. Use several light coats not a single heavy application.
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