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First time shellac user

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Previous Back to: Finishing8 Replies

Welcome! / Forums / General Woodworking Discussions / Finishing / First time shellac user

Tagged: shellac

  • This topic has 8 replies, 5 voices, and was last updated 7 years, 11 months ago by Joel Finkel.
  • Author
    Posts
  • jimbo14
    3 April 2015 at 12:58 pm #126226

    Hi, ive been using liberon sanding sealer on a few of my projects, all different types of wood, oak, cherry, pine and each has 3coats. I have wire wooled first coats and applied wax with wire wool on the final coat and they all looked great. But…any contact with the surface causes the shellac to scratch and leaves a white scratch mark, very brittle. Surely this cant be normal, it looks terrible. Do I have a bad batch maybe?

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    raze599
    3 April 2015 at 4:44 pm #126232

    I’ve noticed the same thing. It’s probably just how it is.

    By the way use sandpaper after the first coat. Worn out 240 or 320, somewhere around there.

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    Matt McGrane
    3 April 2015 at 4:49 pm #126233

    Hey Jimbo. I cannot see why you are getting this brittleness. Do you mean that just touching the surface with anything leaves an ugly scratch? Seems like the wax on top should help protect the shellac. Could it be the wax that is scratched?

    There are a couple of things to know about shellac. First, it has a shelf life. I’ve read that after it is mixed (if it is made from dry shellac flakes), it should be used within a few months. I’ve only ever bought pre-made shellac. And I’ve used it for a couple of years without issues. Although, I did have some once that seemed a little gummy (not brittle) and I thought that could be from getting old.

    Many shellac products come somewhat concentrated. The product I get in the US is Zinsser’s Sealcoat. It is a 2 pound cut, meaning it was mixed in a ratio of two pounds of dry shellac flakes to one gallon alcohol. I thin it to approximately a 1 pound cut (1 for 1 Sealcoat and alcohol) before using it and I typically apply three coats. I know some people use heavier cut shellac for sealing wood or knots. I don’t know if using the heavier cuts make it more brittle.

    Not sure if this helps. Maybe others will add some thoughts.

    Matt, Northern California - Started a blog in 2016: http://tinyshopww.blogspot.com/

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    jimbo14
    3 April 2015 at 5:06 pm #126237

    Yea I mean I made a cook book stand which rests on the kitchen top and at most gets slid into its home when not in use and the shellac on the bottom is all breaking up. If I drag my finger nail down it with very little pressure it will scratch. Yea I cant remember if I used sandpaper or not on the first coat. I will not be using it on my toolchest im making thats for sure! I like how easy shellac is though so I dont want to discount it. For a toolchest with lots of use would anyone suggest a hard-wearing finish?

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    jimbo14
    3 April 2015 at 5:09 pm #126238

    Here is an example

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    Ben Fisher
    3 April 2015 at 10:50 pm #126245

    Paul uses it on just about everything. It must be something we are doing wrong. Again.

    - Ben

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    Matt McGrane
    4 April 2015 at 12:00 am #126247

    That’s what I’m thinking, Ben. And maybe Jimbo is right about just having a bad batch of shellac. Normally works for me.

    Jimbo, if you’re looking for something else very hard-wearing, then I’d go with a polyurethane (which is a varnish). There have been times in the past when I’ve mixed 1/3 poly, 1/3 BLO and 1/3 mineral spirits. You need to be patient with it while applying. Don’t slop it on, because runs can be a problem. Maybe even thin it a little more with min. spirits and apply several thin coats.

    Matt, Northern California - Started a blog in 2016: http://tinyshopww.blogspot.com/

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    jimbo14
    4 April 2015 at 1:10 am #126251

    Haha yes ben, experience is everything. Thanks for the help everyone I blame the shellac I bought.

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    Joel Finkel
    4 April 2015 at 5:32 am #126253

    Shellac is not really good around water. I think Matt’s suggestion to use polyurethane is a good one.

    North side of Chicago. -- "Such a long, long time to be gone; such a short time to be there."

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