This is such a long story I just can't repeat it fully.
Essentially, these jokers got control of Rust Check and diluted the product to make more cash. Rust Check dealers sued and eventually broke away and formed Krown. Each Krown dealer has an equal share in Krown. It's just a better place.
Trick is, and this applies to every service, is finding the best Krown operator. In your area I can't help you out. Some operators apply liberally, some not so much.
May is a great time. The Krown shops aren't that busy so they aren't as hurried and it's fairly dry and the temperature is good.
Myself, I remove the trunk carpet and leave it at home and undo any side panels making it easier for them. Less time they spend struggling with stuff the more timing spraying.
They will drill, with a special bit, the odd hole and it is of absolutely ZERO consequence.