Compatible with seacast?

[mabr]

Sons redoing a transom and looking for ideas to take up area so he wont have to purchase additional seacast.

Calculations says we need 6 gallons. He says it comes in 5 gallons and I brought up why not use some type of filler to prevent having to buy any more seacast. My thoughts are to start with the seacast and add filler to the sides to reduce the overall amount needed. What ever he puts in would be incapsulated so it shouldnt rot would it?

I went to seacasts site an it say that metals expand and contract, and that it doesnt bond to wood so they dont recommend that. But reading what some have written it appears it does stick to about anything. There has to be something we can use. My thoughts were the maintance free decking boards they make nowadays or something simalar. Or how about wrapping ply wood in fiberglass matt or just resin and installing that?

Remember im talking about only using it out side where the motor will sit and it would have continuise seacast incapsulated around whatever we use.

 

[basspirate]

Re: Compatible with seacast?

i did my boat with nidabond. i needed 11 gallons but ran about 1 gallon short.again did not want to spend the money for 1 extra gallon. i filled the transom with nidabond and tried to save the outside top edges for my filler (not really a weight bearing area) which i used polyester resin mixed with some west system 404 filler. then i shoved some chopped glass and some dried pieces of wood into the leftover area then poured in the polyester.
hope my really bad drawing helps explain.





-----<filler here> ------
\ ----------------- /
\ ^ /
\ nidabond /
\ here /
\ v /
-------------------

 

[basspirate]

Re: Compatible with seacast?

________ <FILLER HERE>________
\ _______________ /
\ ^ /
\ SEACAST /
\ HERE /
\ V /
\_______________________/

try to get this drawing again

 

[jonesg]

Re: Compatible with seacast?

i did my boat with nidabond. i needed 11 gallons but ran about 1 gallon short.again did not want to spend the money for 1 extra gallon. i filled the transom with nidabond and tried to save the outside top edges for my filler (not really a weight bearing area) which i used polyester resin mixed with some west system 404 filler. then i shoved some chopped glass and some dried pieces of wood into the leftover area then poured in the polyester.
hope my really bad drawing helps explain.





-----<filler here> ------
\ ----------------- /
\ ^ /
\ nidabond /
\ here /
\ v /
-------------------

I did the same as you but with seacast, I cored the risers on each side of the outboard with 1/2in ply and poured the seacast around it.
And the seacast website doesn't say it doesn't stick to wood, it sticks like stink as long as its not rotted or wet.

I'd go with nida if I did it again, its half the price of seacast.

 

[Mark42]

Re: Compatible with seacast?

You can use the "hair" type filler products IE Tiger Hair, Kitty Hair, etc. These are polyester resin and chopped fiberglass pre-mixed. Usually used in fiberglass autobody repairs, it will work on a boat too. Be sure you check the ingredients, as years ago some contained talc as a filler, which you should avoid (due to its reported water absorbing properties). The last few years when I read the ingredients, talc was not listed on the brands sold near me.

These pre-mixed glass/resin products are usually sold in gallon cans, and are fairly cheap. Buy from a autobody supply so you get fresh product, because old stuff tends to separate and needs to be stirred. Stirring this stuff is misery because it is sooooo thick.

Actually, its not far from the Seacast product itself.