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Cupping issues
Last Post 04 Mar 2020 11:07 PM by Andy Graves. 2 Replies.
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25 Oct 2019 02:52 PM
    I'm reasonably new to fabrication but have a "normal" counter top down pretty good.  I recently made a couple very large island tops.  Largest was 120 x 60.  A couple issues that I'm hoping to get some help with.

    1. By the time I got the adhesive applied it had run off the starting end and left my seam visible.  I had to cut the top apart two times.  To get it to work I finally pushed the two halves very close together so the adhesive bridged the gap when applied.  I finally got the top of the seam looking  good but didn't get the bottom totally filled.  Any suggestions?

    2.  To pull the two sections together I used a single pipe clamp near the middle plus 5 vacuum cups spread out along the length.  The seam had a wavy bit cut edge to help with alignment.  On one end I got some cupping at the seam.  I was able to sand it out but it took a lot of sanding. On very large tops how is the best way to keep everything flat and pulled together.

    Thanks in advance.

    Craig Lucas
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    14 Feb 2020 01:56 AM
    We offer seam these large pieces by standing on their edge. They do not need to be flat on table we use our panel saw.
    Andy Graves


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    04 Mar 2020 11:07 PM
    Hi Moe,

    Sorry for the late response. We keep the seam about 1/8" apart and then apply adhesive in three passes. Start at one end and push the glue into the seam rather than pulling the tip. Then go back to the beginning and do that same procedure two more times.

    This will make sure the glue will cure properly and it will also get it to go all the way through to the bottom of the seam.

    We do not use pipe clamps because it typically puts too much pressure and lifts the edges of the piece creating a cupping in the middle.

    We also don't use the wavy bit because if it doesn't get aligned properly, it will leave a gap between the pieces.

    Hope that helps,

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