divinycell rails

General Discussion
1

I am thinking about building a long board using 1lb EPS (very soft). In order to avoid using a lot of glass I thought I might build it like a hollow. In other words I could make the plainshape out of EPS with a fairly flat deck, apply veneer with water based contact cement. Then I could build up the rails using strips of a stronger material. XPS has de-lamination problems. Does any one know if divinycell is as dense as XPS?.

Mark

2

Divinycell has a variety of densities available, color coded as I remember.

3

http://www.diabgroup.com/americas/u_products/u_prods_1.html

Divinycell and more, with tech specs and other info,

hope that’s of use

doc…

4

Thanks doc. Looks like it is strong and light. I wish I could go to a store and check the stuff out before buying it. Fiberglass supply has it in 1/4" sheets but it is expensive. I may have to just take a chance and order it.

5

In other words I could make the plainshape out of EPS with a fairly flat deck, apply veneer with water based contact cement.

I have not done it yet, but consider glassing with lightweight (2-4oz) glass and epoxy the wood to the eps. See all the sandwich and vac bag threads to see why. But in short your get much stronger with little or no weight gain. You can also go with thinner woods without loosing strength. Benny1 did a wood skine without the vacuum, so you don’t have to go all out to get the effect/benefit.

Oh yeah, Bert has thread “sandwich construction” or something close with a high density (I think divinycell) rails and skins. If you are going to wood the deck and bottom consider wood rails as well. This is what I have planned for my 10’ LB.

just a thought

6

Definately look at Berts thread on using D-cel. I’ve done a couple boards with contact cement and got mixed results. If I did it again I would laminate the inside of the d-cel first with one layer of 2 oz cloth with epoxy and then after drying, cut it and glue it to the blank cloth down. The gluing is tricky because it’s easy to get air bubbles under the d-cell and when the board gets hot they expand. In other words the glueing must be flawless. Having said that I think it is possible for this to work. The best glue to use is called Sta-put. 3M also has a glue that doesn’t work worth beans. Don’t even try that stuff. Roo also has a water based contact cement that I have in my office but have never tried.