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SUBJECT: # 27921: red oak as an under base for fibre glas
Submitted by David R . (72.79.135.85) from PENNSYLVANIA on 12/31/2008 9:39:00 AM
I am increasing the height of the transom on a 222 Aqua sport work project . I shaped the insert piece out of 2" red oak I have on hand. It is super dry. A friend told me that wood may have oils in it that are not compatible with the fibreglas and the resin. He said I should check with a message board and since you all have been so helpful in the past I could think of no other to contact. Thanks for any thoughts on this subject David .
- 12/31/2008 12:08:00 PM
Submitted by
Gene from GA says have you ever heard of
Sea Cast?? I just did my whole transom with it, it works great. Its below...http://transomrepair.com/zk/index.shtml
If you call them they will tell you how to do what you want using their system and no wood.
But if you want to use that oak, I would seal it good on all sides/edges with your resin. If it looks like it adhered ok, then you will be ok. Then you can rough that up with sand paper and go ahead with your project. They/I use red cedar to make kayaks with an epoxy/cloth finish on them, and the cedar works just fine. If red oak is that much different than cedar, I have no idea.
Good luck
- 1/5/2009 12:19:00 AM
Submitted by
Spooled Again from OTHER says Red oak vs cedar
Red oak, like me, is hardwood and cedar a softwood, like..well never mind. Innyhow, red oak is subject to rot at an alarming rate when compared to cedar which is very durable and resistant to rot when subjected to water.Also please note that all oaks are heavy and dense and cedars are not so dense and thus lighter in weight.
Oh yeah sure, oak is the stronger of the two woods so make a wise decision on which is more suitsble for your installation.
The cedar is more suitable for Yak construction if Gene ever completes his project. hehe!
SA
- 1/5/2009 5:17:00 PM
Submitted by
FreeOnBoard from TX says Depends on the height of the insert
David, if that insert is only 2-3 in. high and won't have anything mounted to it (such as the motor), then that red oak will probably be okay if it's saturated with epoxy and encapsulated with several layers of glass cloth and epoxy. Red oak is very porous compared to most hardwoods, both cross grain and end grain, so be generous when applying the saturating epoxy. Don't think red oak is oily enough to cause a problem with epoxy, but you could epoxy a couple of test pieces together and see how well the epoxy adheres when you rip them apart. BTW, when you say "resin", I assume you mean epoxy resin and not polyester resin or vinylester resin, which set up too fast to achieve good adhesion to wood. If you want that insert to be completely worry-free as far as strength, rot, or warpage, you might consider Dunk's method of transom construction, building it with laminations of 1/4" luan plywood and glass cloth. Good luck.
