Same here in SE Queensland. Sometimes I can smell the polyester fumes coming out of my 15 year old surfboard when I open the bag on a hot day.....not good! But that problem is no more with the painted board bags.
Interesting experiment. Nice study.
Aside: the old "Marijuana Grower's Guide" recommended using flat/matte white surfaces rather than aluminum foil or silver for light reflection.
Swaylocks Surfboard Design Forum: thoughts & theories ... practical & theoretical
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That because aluminum stores heat (infra-red) while white paint reflect it.
Maybe mylar or its cheaper version the survival blanket could work for board bags too ?
Did u test survival blanket or multilayer insulation film to get extra protection againt heat ? maybe between the white outer layer and the inside foam ?
Very interesting test indeed ! thx for sharing !
Heads up ball Huck. Good job. Onya!
I found the paint tin used to paint the surfboard bags against heat: "Dulux Weathershield / Vivid White / Low Sheen"
After about a month of regular usage a few pieces of paint have flaked off. I guess less than 2-3% of the surface area so far.
There have been a few hot days (but no stinking hot ones) and the board was on top of the car, parked in full sun. Every time I checked, the board felt just luke-warm!
I'm confident this bag will keep the board safe from overheating when left outside, and inside the car while driving (but not when parking).
Next step will be to try out paint additives and/or base coats to improve paint adhesion. I have some "Penetrol" left over and once the flaking has gotten bigger, I'll check if that helps.
Any suggetstions how to iprove paint adhesion to board bags?
The paint has unfortunately not stuck well enough. It began to flake off more and more, leaving a mess in the car and a Haensel and Gretel tail of small white fragments wherever the board bag goes.
I removed the paint with duct tape, a plastic scraper and a vacuum cleaner. The positive result of it so far is that the paint stuck very well to areas that previously had duct tape on it, which has left a little residue which helped adhesion. See around the fin slot in the bag, which I had taped up. The paint is very hard to remove there.
Also, the paint sticks very well to the soft, black plastic nose and the oval logo on the bag, and no matter how much I bend it, it does not crack.
What this means (I hope) is that the paint will stick well with some undercoat.
The bag was covered yesterday with "Penetrol" and is in the 24hr drying period. Then, I'll paint it again and will let you know how that goes.
Looking forward to hearing how it goes...
Nice work there with the experiments - incidentally, have you done any experiments with a fin-sock style construction (I usually use one of them) for comparison?
Will be interested to see how the undercoat/better paint adhesion experiment goes; you've got me interested in modding a board-bag now :)
And good work too to Huck for moving the thread.
May be stupid... but what about a socks-style boardbag made of simple white coton sheet ? to put over the silver bag ? or even better sewed on it ?
You'll have the white color -> less heat, and no pb of paint flakes or pre-treatment...
Since you started this thread I though about testing this... maybe this WE.