Water Drains - Summary Attempt

[mauro12]

You just spray the cavity wax inside these holes right ?once per year ?

[Pawel66]

Yes. Not once a year. Once, say 5 years will do, I think, with the way we drive these cars - nice weekends.

[Bonnyboy]

Yes - 5 year is about right but don't forget the parts that get trashed with regular driving.   

I spray underneath parts of my car with Crown Rust Control at least twice per year (once in the fall before the salt goes on the road and then again in the spring after the rain washes the salt off the roads).  I like to drive all year round so experience salt and gravel which is nasty to the underneath to my car so I find that I am constantly wire brushing parts to get to bare metal and replacing with new paint.  I will do most of this in the next few weeks after I hose the underside down and let the car dry. 

Again I have a hoist and a place to work but it always makes me feel good to get the car ready for the next season. 

[Pawel66]

Yes, another type of wax goes on a lot of places that are not cavities or closed profiles. I drive in the sun only, so perhaps I do not need to do it so often.