Not clear spray, it cracks with exposure to sun and with UV exposure. A good product is Tectyl 506 spray, it works really well, and will last for decades in direct sun with no hassle and only dust build up. I have undone bolts exposed to salt spray ( I work near the sea) for decades, that were coated with this, and they undid easily ( after the initial brute force to start them) and the threads were nearly perfect under the coat, and the surfaces were unpitted, even dissimilar connections.
BTW be very careful using stainless steel hardware on aluminium parts, the stainless will not corrode, but the aluminium will corrode right next to the stainless, and this intergranular corrosion will be only visible as a white haze on the surface, until the part fails from being corroded all the way through. You need to use a Monel metal fastener, it will not react with the aluminium, and is used in shipbuilding to attach hardware to yacht masts, rigging and engines, but they are pretty expensive. otherwise dielectric grease, placed under the parts as well as over, will slow it down considerably.