# Resin and Glass Weight

I have searched through the archives and I found some information on polyurethane resin and fiberglass weight, but I am still a little confused. I imagine that different blanks and types of wood may absord resin differently and the ratio of resin to cloth will have an impact. But for a generic, double 6oz, single 6oz longboard, how can one figure out how much of the board weight is in the glass and resin? I am trying to decide what a deck patch or another layer of glass will add to the weight of a 10ft board. A previous post gave a rule of thumb 1.5oz per foot of board for 6oz glass, but longboards are wider and thicker. And is does the 1.5oz represent fluid volume or weight? I am aware that cloth weight is in square yards. I can figure out the area and the anmount of cloth, but the finished weight of the resin is the part I am missing. Is there an easy finished weight per square foot formula out there? Thanks!

I have searched through the archives and I found some information on > polyurethane resin and fiberglass weight, but I am still a little > confused. I imagine that different blanks and types of wood may absord > resin differently and the ratio of resin to cloth will have an impact. But > for a generic, double 6oz, single 6oz longboard, how can one figure out > how much of the board weight is in the glass and resin?>>> I am trying to decide what a deck patch or another layer of glass will add > to the weight of a 10ft board. A previous post gave a rule of thumb 1.5oz > per foot of board for 6oz glass, but longboards are wider and thicker. And > is does the 1.5oz represent fluid volume or weight?>>> I am aware that cloth weight is in square yards. I can figure out the area > and the anmount of cloth, but the finished weight of the resin is the part > I am missing. Is there an easy finished weight per square foot formula out > there?>>> Thanks! It’s possible to weigh the materials before you apply them, should give you a pretty good idea how much weight you’re adding. Aloha, Kokua

I kinda thought of that, but I am having a board glassed. To ask another question… Do you happen to know the weight of an ounce of poly resin? Is heavier than water? If I have to I could go to the post office and pour an ounce into a cup an weigh it. Of course these days that might get someone thrown in jail. Thanks for any input!

I kinda thought of that, but I am having a board glassed. To ask another > question…>>> Do you happen to know the weight of an ounce of poly resin? Is heavier > than water?>>> If I have to I could go to the post office and pour an ounce into a cup an > weigh it. Of course these days that might get someone thrown in jail.>>> Thanks for any input! In general resin seem to be just a little heavier then water from the product/safety sheet I’ve seen.(1.05 - 1.2). If you look at http://msds.interplastic.com/html/msds.htm and select the resin in question (silmar whatever kode they use for surfboard resin), it there under spesific gravity(I think…). regards, Håvard

In general resin seem to be just a little heavier then water from the > product/safety sheet I’ve seen.(1.05 - 1.2).>>> If you look at http://msds.interplastic.com/html/msds.htm and select the > resin in question (silmar whatever kode they use for surfboard resin), it > there under spesific gravity(I think…).>>> regards,>>> Håvard Now all I need is to find my calculator. Thanks!