Getting rustproofing done in the rain???

I'm scheduled to get my rustproofing spray done on my car in the morning (Corrosion Free), but it is supposed to rain. Am I wasting my time to be getting it done on a rainy day?

The Corrosion Free website says that rain does not matter, but it seems that spraying onto a wet frame would be less effective than a fully dry frame.

Thoughts?

 

Seems unwise to trap moisture...

 

Ditto!

 

It is an oil-based undercoating...does that trap in moisture??

 

I just had an annual undercoating done on my truck yesterday. They said it can be applied on a damp undercarriage because the characteristics of the product "displaces" the water. They applied it dry (thank God) but it poured all afternoon. It is a similar product to Krown.

Edit: The company is ProFleetCare and apparently it was started by one of the founders of Krown. Their product is called ROC 40.

 

I use Rust Check (Canada) which is also petroleum based - no it won't trap in moisture.

It creeps everywhere over time, so I think you're fine.

 

For what it is worth, I just had my second annual application of Corrosion Free rust-proofing done last Friday. In both cases (last year and this year), they wanted me to drop the truck off the night before so they could bring it into their garage overnight and dry off before applying the oil-based coating the following day. Their stated reason was that the coating adhered better to a dry surface than a wet one; not that it wouldn't work with a wet surface - just that it worked better on a dry surface.

As for it possibly trapping moisture, I really can't speak to that except to say this a oil-based film-type coating that remains viscous and should be reapplied at least every 12 to 18 months; it's not the old-fashioned tar-like coating that hardened on the frame and then over time (years) delaminated allowing moisture to get between it and the frame which resulted in accelerated rusting.