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powersloshin said..you should not separate the rig and board. keep mast base facing the wind and roll the board on top of it. Then when you are ready to unpack separate the rig, orient the board facing the wind and take the rig first

Correct, also take your gear to n from your vehicle without the sail and board bag its uncool to do this, and a waste of time

When it is very windy and the board starts to dance in above position just kick sand up and along the rail. This stops the wind getting under it and deflects air flow up n over the board n rig. Sand will also end up accumulating on the foot of the sail which will also hold it down otherwise just kick it on there as well.
Lifes short and sails are meant to get wet and sandy, you really only need to wash them every once in while when conditions get like this below. Otherwise just take them straight from the water minus sand, drain/dry em' a bit, roll em up.
And yes some of these rigs are pointing into the 50 plus SW wind, put enough sand down and it will be fine

'88 SandyPt