Rounding corners on vinyl trim

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  • dlminehart
    Veteran Member
    • Jul 2003
    • 1829
    • San Jose, CA, USA.

    #1

    Rounding corners on vinyl trim

    I've windowed-in my Mom's back porch, replacing screens with white vinyl-framed sliding glass doors, with matching vinyl-framed transom windows overhead. To trim this out, I was thinking of using matching 1x4 white vinyl trim boards from HD, with 1/2" quarter-round covering the inevitable little gaps. While the vinyl trim is about 3 times as expensive as wood, I'd not have to deal with taping, priming, painting, and cleanup.

    These 1x4s have square corners that I want to round over where they are visible. Given the cost of these boards (about $18 for 8'), I don't want to screw up. I can think of two likely approaches. (1) A round-over bit in my router. Perhaps 1/8". Without decent bench, clamps, etc., I worry about doing a clean job with this method. (2) A manual cornering tool that looks like a two-ended spoon with slots cut in the bottoms of the spoon bowls. Here, I don't know how well these cutters work on dense vinyl. I'd have to buy a bit or the cutters; bit about $25, cutters less than $15.

    Anyone used either of these methods on this kind of trim material? How'd it work for you? Any suggestions on proper use?
    - David

    “Be yourself; everyone else is already taken.” -- Oscar Wilde
  • Stytooner
    Roll Tide RIP Lee
    • Dec 2002
    • 4301
    • Robertsdale, AL, USA.
    • BT3100

    #2
    I would just use a deburring tool. I have many of these on hand though.
    Makes a nice edge on plastics and vinyl.
    Very easy to use with good results.
    Repeated use will get a more pronounced rounded look.

    http://www.mcmaster.com/#bur-tools/=9dfuj9

    A roundover bit would work fine too though. Probably would give a nicer finished look than the deburrer.
    Lee

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    • twistsol
      SawdustZone Patron
      • Dec 2002
      • 3087
      • Cottage Grove, MN, USA.
      • Ridgid R4512, 2x ShopSmith Mark V 520, 1951 Shopsmith 10ER

      #3
      We just trimmed out all the windows and doors of our house with the same stuff. It machines really well with a router. W have an antique leaded glass window with a wooden frame that is shallower than the rest of the windows on the house. I used a panel raising bit to put a wide cove on the pieces for that window.

      We did notice that the machined areas yellowed within days when exposed to sunlight so we (my wife actually) painted it all with a semi-gloss white exterior trim paint.
      Chr's
      __________
      An ethical man knows the right thing to do.
      A moral man does it.

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