|Topic Review (Newest First)|
|12-13-2011 01:28 PM|
|12-13-2011 01:07 PM|
See Surface Preparation
|12-13-2011 12:09 PM|
|Rhodes143||Thanks sailing fool, so you are recommending to wet on (no fillers) 3-5 layers of West then add the filler compound to fill in remaining voids. Then do one final wet layer?|
|12-13-2011 08:58 AM|
I've done this job three times with West System epoxy, including a R19. West System is the way to go, as it is much harder than Interprotect, and will protect steel much better. Apply directly to freshly ground metal. Five coats is good. Use microballons for filler, it is much easier to sand than colloidal silica. Put the final coat of epoxy over the filler.
Interprotect is formulated for easy application over large areas ( the hull) and ends up being a little soft, you can crease it with your fingernail. Good for the hull, but not for steel.
|12-13-2011 05:49 AM|
Originally Posted by mitiempo View Post
Colloidal silica is a good thickener for underwater use.
|12-13-2011 02:47 AM|
|celenoglu||Use only epoxy for coating and do not use low density fairing. this is not a good alternative for underwater use. Instead use glass (sanded down glass fiber) mixed to epoxy for fairing.|
|12-13-2011 12:51 AM|
Virtually and normal additive to epoxy will strengthen it with the exception of the light fairing additives. I'd go with whatever is less expensive.
The key is to do it on a dry day and the first coat on the iron keel has to go on right after the sandblasting or whatever method is used to get to bare metal. It will start to oxidize in an hour or so.
|12-12-2011 11:42 PM|
|12-12-2011 10:47 PM|
|Rhodes143||Thanks for your comments. I was just told that a formulated barrier coat is stronger than West systems when it comes to cracking and chipping. Does adding the West barrier additive add strengthening properties to it. I ground the keel with 16 and 20 grit, it is fairly smooth to the naked touch but it is in no ways to smooth for epoxying I would think. I am leaning towards using interprotect 2000 instead of the west systems I think. After this is used I'll follow up with West Low density to fill gaps and fair.|
|12-12-2011 09:50 PM|
|WesAllen||If I'm not mistaken the barrier coat is epoxy with a special additive. West System does sell this additive I know because I have some and bought it locally. I don't see why putting it on first would be any better. The main thing is to make sure the cast iron is free from rust and other contaminates. Plus don't make the cast iron to smooth. If the surface is to smooth it won't adhere as good, because this is a mechanical bond.|
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