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Author Topic:   old transom material
dolphin posted 03-21-2002 05:04 PM ET (US)   Profile for dolphin   Send Email to dolphin  
This was posted on the performance site as well. my '80 revenge has a soft transom. Is the inner core plywood (which I suspect) or is it a brown foam? I believe it is old wood that rotted brown from moisture ingestion and will necessitate removing the inner glass and re-bonding new marine ply to the outer skin and then reglassing the inner with a few layers of bi-axial and matt. Any thoughts or opinions?
JBCornwell posted 03-21-2002 06:27 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Plywood, Dolphin.

Real sorry to hear that. :(

Red sky at night. . .

Salmon Tub posted 03-21-2002 07:37 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
Hey dolphin, maybe you could get a piece of whaleboard from whaler or dealer to install. Aluminum would be nice but costly and would oxidize. Stainless steel is way too heavy. But if you are going to go through the trouble, I would say dont bother with even marine plywood. Better to go for the gold.
whalerron posted 03-21-2002 09:17 PM ET (US)     Profile for whalerron  Send Email to whalerron     
I question whether or not whalerboard is as strong structurely as plywood. I would hesitate to use whalerboard in the transom where all of the force is going to be pulling on its face. Does anybody know if whaler uses whalerboard in the transoms of the new boats? If so, then I guess it's not an issue.
dscew posted 03-21-2002 11:08 PM ET (US)     Profile for dscew    
They use plywood, I don't know if it's marine or treated or both or either. I would think treated plywood would be the strongest, and obviously would never rot, even in standing water.
Chris J posted 03-22-2002 11:11 AM ET (US)     Profile for Chris J  Send Email to Chris J     
I'm afraid I will be looking at a similar repair one of these days. My planned strategy is to cut out the old plywood from the inside, and bed in multiple sheets of 1/4" ply soaked in thin epoxy (System Three Clear Coat or the like). The result should be water impervious and plenty strong, and the multiple thin plys will follow the shape of the transom better than a couple of thicker pieces would.

The whole thing will have to wait until i retire, though. I can see it taking a few weeks from start to finish.

dfmcintyre posted 03-22-2002 04:02 PM ET (US)     Profile for dfmcintyre  Send Email to dfmcintyre     
Dolphin -

Bad news....they didn't use brown's rotted wood.

When my 21's transom was repaired this is what the shop did:

Cut out from the outside the transom and used marine grade plywood, epoxyed into place. There is now more plywood in the transom that came from the factory.

Then they added glass to build up the outer skin and painted it. It's flawless. The only observable difference, is that the upper edge of exposed glass and resin mix, that's kinda dark green in color is missing.


The repair shop, when mounting my engine, overdrilled the holes about 1/4 -3/8's of an inch bigger. Taped over one side and filled the hole with resin. Let dry overnight and drilled the proper sized hole in the resin plug.

That way there is no water penetration, if the bedding compound loses it's integrity.

The West epoxy company manuals call the plug an, annealus....I think..


whaletail posted 03-24-2002 10:51 AM ET (US)     Profile for whaletail  Send Email to whaletail     
Don't mean to differ with you dscew, (dennis) but I was just in a BW dealer, and was shocked to find out that they're using Starboard in the transoms now!
Ed Stone posted 03-24-2002 08:32 PM ET (US)     Profile for Ed Stone  Send Email to Ed Stone     
As of the year 2000 they were still using
plywood in the transoms.I was told that
nothing tested stronger for transoms
than plywood.
There was a rack with loads of precut
transoms ready for assembly.
Ed Stone
Tom W Clark posted 03-25-2002 12:44 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
My understanding is that Whaler is, and always has, used plywood (I believe two layers of 3/4") in the transom.

The use of pressure treated plywood might be beneficial, but do not be fooled: pressure treated plywood can rot! Chemical preservatives can slow down Mother Nature but they cannot stop her. I have seen plenty of rotten pressure treated lumber and plywood in my trade over the last 15 years.

If pressure treated plywood is used in a boat it had better have some pretty special treatment in terms of drying and not be the same grade as the crappy stuff you see at the lumber yard. CDX is not what you want in your boat.

No matter what your transom is made of, if water is allowed in there, you will have a problem sooner or later.

Chris J, I think your repair strategy is sound but unless you own a 13' you need not worry about bending the plywood. Whaler transoms are flat where the plywood reinforcement goes. Also, beware that even if you use epoxy saturated 1/4" plywood, it will still rot if any hole allows water to come into contact with any of the layers. The epoxy will not totally saturate the plywood itself.

Hendrickson posted 03-25-2002 06:42 PM ET (US)     Profile for Hendrickson  Send Email to Hendrickson     
Take a look at the Seawolf product: The product is called Seacast and is designed to be a composite transom. I plan to use pieces of an old cut up boat (Larson) and laminate the pieces together with West epoxy and that should make a pretty strong composite/glass transom.

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