raw box

Comment by Björn on September 23, 2013 at 11:56pm

Hi,
i am just seine that you seem to use Coosa material (I am just working on a project where I use it for the first time bulging a locker box aft of the cockpit). What is your experience with it, do you typically completely glass ist all over or just epoxy coat and then paint it? Do you see any drawbacks vs plywood? Anything to put special attention on?

Comment by boatsmith on September 24, 2013 at 9:05am

Coosa is designed as a plywood replacement. It comes in two flavors a light wieght version at 15 lb/cuft, and a structural version at 26.5 lb/cuft. THe structural has two layers of glass roving imbedded in it in addition to all of the random fibers in the product. The disadvantages are it is very itchy stuff to work and is tre' expensive. Other than that it is way cool imo. It does not need to be glassed. it can be filleted and maybe tabbed and painted . We use AwlGrip paints. I would suggest seal coating prior to using a less durable more permeable paint system.If you sheath one side, I recommend  sheating the other side as well or it will tend to warp. This will be less of a concern with epoxy vs poly or vinyl resins.

Comment by Björn on September 25, 2013 at 4:02am

Thanks for your comment and advise! I know the itchy feeling :-)

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