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Thread: Gummy Varnish from electric sanding?

  1. #1
    Join Date
    Mar 2017
    Location
    Roswell, GA, USA
    Posts
    23

    Default Gummy Varnish from electric sanding?

    On the sides of some deck boards, I just wanted to rough up the old varnish with an electric sander since they are not visible. I've been scraping off gummy residue that goes down to bare wood. Figure the heat from sanding made the old varnish do that? It doesn't harden. Usually only on the edges.

  2. #2
    Join Date
    Nov 2011
    Posts
    3,973

    Default Re: Gummy Varnish from electric sanding?

    Are you sure it's varnish? Sounds like linseed oil to me.

    Sounds peculiar to me. The edges of the deck boards? Got some photos?

  3. #3
    Join Date
    May 2012
    Location
    Central Ohio
    Posts
    463

    Default Re: Gummy Varnish from electric sanding?

    How clean is your sandpaper? Are you using the purple/green/yellow stuff whose pkg. touts 3x longer life or something like that? Don't remember the brand, but it is nice and sharp, and stays that way if you clean it often. (I can update brand tomorrow if needed.) Paper that gets clogged and stays clogged will get quite hot.

    Chip

  4. #4
    Join Date
    Nov 2011
    Posts
    3,973

    Default Re: Gummy Varnish from electric sanding?

    And if the stuff your sanding off goes into a collection bag it may spontaneously combust. No kidding, it happened to me.

  5. #5
    Join Date
    Jan 2011
    Location
    Norwalk CT
    Posts
    695

    Default Re: Gummy Varnish from electric sanding?

    You want to use stearated paper. It doesnt clog and it stays sharper longer.

    Sanding dust from finished wood is a real explosion hazard as Gib says. It should NEVER be contained in a closed vessel unless it has been liberally wet down. Even in an open top barrel, if it is packed too densely it can spontaneously combust.

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