seacast dosnt stick to epoxy?

[thehermit]

I have to replace 5 stringers rougly 20' long. They are in various stages of degredation. I can pop them out of the woven roving and do the seacast thing pretty easily...except for the hit to the wallet. The Seacast web site says it will not stick to epoxy resin. Is this true? I do not want to use a poly resin to layup the transom which will be marine plywood (2 layers 3/4 and one 1/2 already cut and waiting). I could use seacst on the forward parts of the stringers and tie in to the transom with wood...or I can replace the wood.<br />Any clues on seacast stringers?????

 

[Whit]

Re: seacast dosnt stick to epoxy?

Seacast is polyester based and poly over epoxy is a no no. That's also why it;s not recomended for use with wood. The bonding issues with Seacast are a concern-particularly with transoms

 

[zzub]

Re: seacast dosnt stick to epoxy?

Seacast will bond to epoxy if you first coat the inside of the stringers with the speacial adhesive they sell for bonding the Seacast to alluminum boats , Call Seacast and check with them,they are very help full.<br /><br />BC

 

[thehermit]

Re: seacast dosnt stick to epoxy?

OK I am bailing on the seacast! Hey but epoxy over poly is ok right? I am going back to the wood for the stringers. Got into it last night and one is totaly gone and the others I will be doing partial repairs on. I did take one stringer completely out last night and think I should be doing one at a time as there is no transom/deck/or gunnels left on the boat. I dont want it to loose its shape completely.

 

[ThomWV]

Re: seacast dosnt stick to epoxy?

Let me suggest this to you, and it applies if you're working with polyester, vinylester, or epoxy, if the set is cured completely and you are laying up on top of it, no matter if its the same sort of resin or if you are mixing no matter which way, hit it with a grinder first to give a good complete scratch to the surface and then clean it completely with acetone after you vacuume it clean. That will give you a mechanical bond and you're simply not going to get any other way and that goes a very very long way to having a patch or lamination that stays put.<br /><br />Thom

 

[thehermit]

Re: seacast dosnt stick to epoxy?

Thom,<br />I have grinded the inside of the transom skin and gotten good adheasion with west system to the boat hull (transom). I am just assuming it is some type of poly from what I see. Does anyone layup a hull with epoxy? I wouldnt think this one is. I do plan on grinding/cleaning and coating the inside of the hull with new epoxy. The cloth (existing over stringers) will soak up some new stuff. <br />hermit

 

[mutron77]

Re: seacast dosnt stick to epoxy?

Herm,<br /><br />I cut my stringers out and it left pockets of old glass and poly that I could plug the new stringers into. I just cleaned out old wood, filled the pockets with thickened epoxy and pushed the new stringers into place letting the excess epoxy squish out. Tied this all into the hull again with biaxial tape. Sound like you may be able to do this too in your case.<br />H90

 

[thehermit]

Re: seacast dosnt stick to epoxy?

horse,<br />gona do just that...I have one stringer out and part of another out but will do others as I can get new wood in (i.e. one at a time as not to loose shape) I am stockpiling gallons of west while they are on sale and await nice weather here on the south coast of my sand bar. I was thinking of using CPES but am going to go with west. Either way I think the boat will outlast me.