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View Karda's profile

gloss finish is rough

by Karda
posted 11-23-2018 04:37 AM


10 replies so far

View TungOil's profile

TungOil

1213 posts in 860 days


#1 posted 11-23-2018 05:04 AM

The grain raised. Happens with water bourne products. Sand again and reapply.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View Woodknack's profile

Woodknack

12778 posts in 2745 days


#2 posted 11-23-2018 05:12 AM



The grain raised. Happens with water bourne products. Sand again and reapply.

- TungOil


+1

-- Rick M, http://thewoodknack.blogspot.com/

View oldnovice's profile

oldnovice

7475 posts in 3733 days


#3 posted 11-23-2018 07:44 PM

All seem to be in agreement, sand and reapply!

1000 grit, why?
I would think 220 should be good enough for a first coat of poly.

-- "I never met a board I didn't like!"

View WoodenDreams's profile

WoodenDreams

587 posts in 276 days


#4 posted 11-23-2018 09:51 PM

You should expect the grains to lift some. When you sand between coats, don’t take off all the poly coat, just the raised grain. I usually apply 4 to 5 coats of poly, and a light sanding between each coat.

View Karda's profile

Karda

1486 posts in 919 days


#5 posted 11-24-2018 12:28 AM

thanks, I sanded after 1st coat with 1000 and the surface was still rough, I will try again with a coarser paper and see what happens. I use 1000 on my bowls because I had some and tried it and it gave a smoother surface than 500.

View bilyo's profile

bilyo

663 posts in 1467 days


#6 posted 11-24-2018 01:32 AM

If you have used stain on the wood before the first coat of poly, I suggest that you ignore the raised grain from the first coat and go ahead with a second coat before you do any sanding. The first coat is very thin and you risk sanding through and removing stain color in small areas. After the second (or even third, depending on how thin your application is) you can sand with 220 or 320. Be very careful; especially on edges. With every successive coat, you can sand with progressively finer grits between coats. I always finish with 600 grit wet/dry using soapy water to lube. Silky smooth!

View Karda's profile

Karda

1486 posts in 919 days


#7 posted 11-25-2018 12:07 AM

thanks for the sanding tips, is any body else not getting notifications, I have not recieved one nottification for the thread or another I have going.

View Kelly's profile

Kelly

2284 posts in 3309 days


#8 posted 11-30-2018 04:48 PM

Just a tip: Use a lube with your sandpaper so it doesn’t load quickly. That could be oil or water, but for this (waterborne finish), I’d stay with the water.

I’ve also gotten rough finishes from just dust in the air or contamination in the brush. If it wasn’t ridiculous, I ignored it until near the last coats. Then I knocked it all down with water or mineral oil and 600, before moving on to polish compounds.

I did a slab once and it felt like running your hand over it would remove all the skin. I took this approach and, when done, it looked like a sprayed on finish.

If dark wood, you could try mixing pumice and water/oil to buff, then clean the surface and switch to rottenstone and water/oil. If you want even more shine, you can go to a swirl mark remover for auto paint.

View Kelly's profile

Kelly

2284 posts in 3309 days


#9 posted 11-30-2018 04:49 PM

As to notifications, that has been a common problem for me on this and other sites for ages.

View Karda's profile

Karda

1486 posts in 919 days


#10 posted 11-30-2018 05:05 PM

after sanding I wipe of the bowl with paint thinner and let dry, I haven’t noticed any changes in the grain. The last one I did I wiped the finish on and it worked a lot better.

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