Mudguards on caravan held on by 6 screws on top of these screws are little CAPS to keep the screws from going rusty, does anybody know where i can get those little caps ?
I've seen two types of cap; one which fits beneath the screw and has a hinged lid to seal and the other just being a simple cap of the right diameter to the screw head, that simply clicks on.
Long term, both will allow moisture inside and don't prevent screws going rusty. IMO, I'd use a small blob of translucent sealant over each screw.