Pine or Fir is soft wood with harder grain - Router Forums
 
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post #1 of 4 (permalink) Old 07-15-2014, 03:49 AM Thread Starter
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Default Pine or Fir is soft wood with harder grain

what I am trying to accomplish: background ...
black smooth semi glossy finish without grain of wood showing through.
this project has 8 in radius corners cut from 3 pieces of wood jointed and glued to turn 90 deg then cut with band saw for radius then sanded smooth with coarse grit sandpaper. this produces a somewhat wavy surface from the soft and hard parts of the grain.
some of you are probably thinking good luck with that.
What is the best way to harden the soft parts of the wood to match the harder grain
so it will sand more evenly. and can i ever get a smooth flat finish.

I was hoping a sanding sealer would help?? at this point I need some suggestions.

yellow glue as a sealer/hardener

I have water base polyurethane which is hard when dry that is can use as sanding sealer. but seams to take a lot of coats.
ANY SUGGESTIONS?
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post #2 of 4 (permalink) Old 07-15-2014, 09:59 AM
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MDF doesn't show grain. Many glues will clog sandpaper if you try to sand them. D fir is possibly the worst of all woods to show grain. Quarter sawn will probably show grain less but it would be a terrible waste to paint it. Sanding sealer might help but I'm thinking you might need quite a few coats of paint with sanding in between to get what you want.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #3 of 4 (permalink) Old 07-15-2014, 10:05 AM
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Originally Posted by Rob Allgood View Post
What is the best way to harden the soft parts of the wood to match the harder grain so it will sand more evenly. and can i ever get a smooth flat finish.

I was hoping a sanding sealer would help?? at this point I need some suggestions.

yellow glue as a sealer/hardener

I have water base polyurethane which is hard when dry that is can use as sanding sealer. but seams to take a lot of coats.
ANY SUGGESTIONS?
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post #4 of 4 (permalink) Old 07-17-2014, 11:05 PM
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One thing you might consider is Minwax Wood Hardener. It's used to penetrate and harden dry rot affected wood.

Basically, it's a hard plastic (polycarbonate, I think) dissolved in acetone, and I've heard of some people making their own by tossing scraps of Lexan into a bottle of acetone. It should penetrate the softer grains very well, and hardens them to, well, hard plastic.

I think that it should make even sanding much easier. I bought a bottle at Home Depot a couple of years ago, but not sure if they still carry it. BTW, in my experience uneven grain sanding happens more easily with coarser grits- you might get acceptable results just by going to finer grit sandpaper.

As a teacher liked to tell me, my advice is free and worth every cent

Good luck.
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