Mobydisc said...
My Tabou Rockets generally stay in their bags when not in use and live inside my van. I sometimes undo the vent screw but not that often and after two years they are still okay. Usually before going out for a sail I'll undo the vent bolt and leave it for a while and then put it back in before getting on the water.
The board bags are nornally not completely zippered up so a bit of air can get in the bag. The boards are normally rinsed in fresh water before being packed up.
David Of Gybe sports says -
About 3 years ago a lot of the board makers were having a couple of problems, one was a blistering of the pain on the bottom of the board that did not seem to have any reason. And the other was a popping of the laminates on the bottom after long periods of storage. After a lot of research by Cobra who make 90% of boards they found that when a board is a in a bag wet and gets to a temp of between 50-60 degrees in the bag, the pressure inside the board tends to leach out moisture on the skin of the board,, Epoxy resin and glass fiber is not 100% impervious to water vapour, nothing really is, plastic materials like abs are even worse for this. They found the moisture would form under the skin of the paint. There is a chemical and physical reaction going on here called osmotic potential that involves both a the moisture, heat and pressure difference between inside and outside of the boards.
2 things were noted.
1 if the plug was undone, releasing the internal pressure of the board, this would equalise the difference in both humidity and pressure.
2 if the board and bag was dry it would not occur either. So I recommend to my customers taking a towel and drying down the board before you put it in the bag after sailing.
I stress though that this is only the case in very extreme conditions, there are many boards sitting in the hot sun all day in schools from the Arab states to the med that last for 3-5 years so I wouldn't be too concerned.