I’m about to glass a couple of boards for the first time. Both are at or just under 8’ and I will have double 8 on top and 8 on the bottom. Is there an equation for the amount of resin I need? I saw the epoxy section and have been through lots of other topics and searches but haven’t found any.

Thanks for the help! Also if it matters i’ll most likely be working at around 18 degrees celcius as I’m in Norway at the moment

I usually go with the same equation used with the epoxy resin. Pretty basic and usually dead on. Going by your 8’ board: double 8/oz deck, single 8oz bottom , equation would look like this: yards x ounces x 1 to 1.25=resin needed. So 8’= 2.67 yards rounded up. So for the deck calculate total ounces per yard so thats 8+8=16oz per yard. Put in equation: 2.67 x 16 x 1= 42.72 ounces. at 1.25 its 53.4ounces. I normally use 1.5 as the last multiplier to give extra to play with. Hope that helps.

Ignore any recommendations such as “1 1/2 qts per side” or whatever… you need to know board length, weight of cloth and how many layers to even come close. If using UV (good idea in cold weather), you can get away with a bit less. With MEKP (conventional catalyst) in hot weather, mix a bit more. Having to work fast results in more waste. If new to the glassing game, always round up and just go with the 1.5 multiplier - better to have a little on the floor than to run short.

Just a quick bit of mental arithmetic, that 8+8 x multiplier gives 53.5 oz which roughly converts to 1.5 litres. Would it be correct for other lengths and weight cloths to add the two together and move the decimal place to get the amount in litres? ie, 6’ and 6oz cloth, 6+6 is 12, therefore 1.2 litres? Could be onto something here?