You can keep tons of sand out the holes if you duct tape in few layers over the holes in the frame while blasting.
Put the 2K {K36}primer on within 3-4 days in weather conditions hot as long as 7 when cold with out scuffing past this time it must be scuffed to stick.
Yes i know it is cold right now just giving that info for when you use it in the summer{later on}