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Repairing rot in a plywood sign? #733742
Mon Aug 05 2019 05:08 PM
Mon Aug 05 2019 05:08 PM
Joined: Jul 2005
Posts: 5,343
Raleigh, North Carolina
gulfiend! Offline OP
Veteran Member
gulfiend!  Offline OP
Veteran Member
Joined: Jul 2005
Posts: 5,343
Raleigh, North Carolina
...I just got a couple of plywood advertising signs that were originally used on a large highway sign/billboard, circa the late 1950s-mid 1960s...I'm guessing the plywood is some sort of marine plywood (thin but very rigid), faced with a laminate on two sides: one side, some sort of Scotchlite reflective sheeting; the other side, a solid color...

...90% of the sign edges are fine, but there is rot along one edge on both sections...it appears to be where the sign made contact with the floor/ground during storage...I'm not interested in trying to 'restore' the sign, but I want to stabilize what's there, so I'm not chipping large pieces of Scotchlite off the edge 😕...the laminate is solid on the face, but very brittle on the edge...basically, some of the plywood has been hollowed out along the edge, with some soft wood remaining as well...

...a Google search of 'restoration of rotted plywood' revealed what might be just what the doctor ordered: a product called CPES (Clear Penetrating Epoxy Sealer)...looks like a lot of boat guys swear by the stuff, for fixing plywood and wood trim on boats...apparently it's used on window sills on old houses...anyone here have experience with the product? Mainly concerned if it works - or might work too well, what effect it would have on the laminated surfaces, if any, etc...

...can't post pics until tomorrow - but I'm guessing most of us have seen plywood where one edge has rot...figured I'd check here before I bought/tried anything...any wisdom would be appreciated...thanks!


Looking for better Gulf items: signs, globes, cans and paper - especially porcelain Gulf flanges, and Gulf A-38 & A-62 ad glass...
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Re: Repairing rot in a plywood sign? [Re: gulfiend!] #733762
Mon Aug 05 2019 11:40 PM
Mon Aug 05 2019 11:40 PM
Joined: Mar 2012
Posts: 816
Maltby, WA
Young's Union Offline
Petro Enthusiast
Young's Union  Offline
Petro Enthusiast
Joined: Mar 2012
Posts: 816
Maltby, WA
I had my talented carpenter friend repair an original plywood tire cover for a Corvette that was missing or had a bad edge. He straightened out the cut then cut a matching piece but somehow cut the replace part to have a spline on the edge butting up to the good piece and cut a groove in the covers edge to accept this piece. Once glued in place and painted black it was not hardly noticeable. And very strong.


ALWAYS LOOKING FOR ANYTHING UNION 76 WOULD LIKE TO FIND A UNION 76 BALL TO DISPLAY NEXT TO MY SHOP.
Re: Repairing rot in a plywood sign? [Re: gulfiend!] #733765
Tue Aug 06 2019 03:20 AM
Tue Aug 06 2019 03:20 AM
Joined: Aug 2011
Posts: 1,701
Cataula, Georgia, USA
Catauladave Offline
Veteran Member
Catauladave  Offline
Veteran Member
Joined: Aug 2011
Posts: 1,701
Cataula, Georgia, USA
https://www.lowes.com/pd/minwax-woo...HngWjhhx8xoCr-EQAvD_BwE&gclsrc=aw.ds

I have used this stuff with good results. Experiment first. You can use fine sawdust as a filler. This stuff pours like water and has good penetration. Let us know. Good luck. Dave

Last edited by Catauladave; Tue Aug 06 2019 03:20 AM.

Dave Jones
It's All Just Stuff
Re: Repairing rot in a plywood sign? [Re: gulfiend!] #733767
Tue Aug 06 2019 05:56 AM
Tue Aug 06 2019 05:56 AM
Joined: Jan 2019
Posts: 22
Binghamton, NY
AlF Offline
Member
AlF  Offline
Member
Joined: Jan 2019
Posts: 22
Binghamton, NY
I am a professional furniture restorer. The epoxy approach is what I would take. Clean out the edges, get rid of all rot. Build (clamp) some forms lined with wax paper to the edges. (The forms will sandwich the plywood.) Pour in your epoxy. I use the West System epoxy available through: https://www.jamestowndistributors.com/userportal/main.do .They also have a fiberglass filler for the repair if it is large.


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