There are several places water can get into any given jack. Water should be able to drain out though. If the exit points which would be at the lowest point are clogged then the water would not be able to exit. You could use a jack cover like # UF38-944020 for future use. There is no telling how much damage is really done. If there is enough corrosion then something inside could be structurally compromised and fail when you have weight on the jack. I would not be comfortable offering...
I purchased this cover for my BD500199 electric tongue jack. It fits great, looks good, and stays in place while driving... one bit of advice though: my level blistered, or shattered, I'm assuming from heat. the cover basically rests right on top of the level. I contacted etrailer and they sent me a new level. I have a foam insulator between the level and the cover now. 541015
If your order is in stock and we process the charges to your credit card, it will ship within 1-5 business days from the date of your order (please allow 5-7 business days for processing and manufacturing from Carver, Classic Accessories or Coverking as your purchase will be manufactured to your specifications). ALL Goldline RV Covers will ship out in 2-3 weeks as they are custom manufactured per order. Please allow 1-6 business days for delivery after your order has been processed. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at email@example.com
Even after I read the many bad reviews I decided to give this a try. I wasn't going to just let my tongue jack get rusty and broken. I know alot of you said it leaked and wasn't water resistant so I decided to use my waterproofing spray I use on family shoes on this cover. After a few crazy wind/rain storms it is staying dry. Hubby and I are happy with it.