seacast transom

[doodlebug]

I used arjay ceramic pour in my transom,not seacast real
easy to use hard on drillbits, price was better also.it
holds 250's well

[hermco]

There are many pourable fillers available nowadays. Here is another incorporating the ceramics,

NIDA-BOND POURABLE TRANSOM COMPOUND is ceramic filled polyester exhibiting exceptional physical properties. In particular, the compressive strength has been documented by an independent testing laboratory to be 3,895 psi (ASTM 695). This is several times that of plywood and 8 to 10 times that of PVC foam. In addition, the failure mode shows elastic yielding before failure. This makes the NIDA-BOND POURABLE TRANSOM COMPOUND material an excellent choice for critical applications such as coring transoms on power boat hulls. web page

http://www.nida-core.com

[weekender]

Hermco or anyone familiar, could you give me a ballpark guess how much poorable product it would take for a transome similar to this?

[hermco]

web page

[weekender]

thanks Hermco, boat is 150 miles away right now, I was hoping you had a guess, 5 gal, 10, 15?

[thehermit]

Hey I know that ass end! just for the record its a marine plywood core

[hermco]

Do the math.

[McGillicuddy]

Rough numbers, 2" thick, 25" transom 8' beam will be about 20.5 gallons... I suck at math so your numbers will vary. Take Hermco's advice and do the math...

[dtmackey]

I looked into plywood and Nida-core materials and decided on Nida-Core pourable. I had a gallon sent and did some lamination testing and strength testing and found it to be fine for what I'm using is for in my transom with a 250 and 30" shaft. The function the core is to separate the outer skins and keep them bonded. Your strength is in the inner/outer fiberglass skins, not the core. Think of a balsa cored boat - how much strength is balsa adding???

D-

[jonesg]

I just got through doing my transom w/ seacast,
its interesting stuff.

Use unwaxed poly resin,
promote it with DMA .05% by volume.
Add some cabosil to prevent the resin from draining out of the mix. A texture like thick corn syrup is a good starting point.
Store this a couple of days, catalyse with bpo (benzoyl peroxide is available at ace hardware for using with bondo putty) add chopped fibre and its ready to pour.
Just follow the seacast directions.

dimethylaniline (DMA) available from chemical suppliers, hard to track down but its out there. It must be used with BPO or the resin will not harden, its in bondo but bondo isn't too usefull.