Epoxy and rust creepage

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Panelwagon62

Hi all. Epoxy is supposed to be really good at preventing rust creepage correct? For instance if you get a stone chip and it goes to metal, rust should not creep any further? Also, lets say you have a rusty door off an old vehicle. You sandblast the inside of the door and outside, on the inside where the door skin fold over the shell there is obviously going to be rust between the two panels so you would sandblast and epoxy that lip. How can you be so sure the rust will not form and come back from in between the two panels? I would like to hear a from anyone willing to share their info. Thanks
 
If your rusted part is protected from the elements that make it grow the corrosion will stop growing-that's my theory anyway... rust that's exposed will continue to grow and eat at the base metal. That chip to bare metal will start rusting, will it creep and grow if the area surrounding the chip is protected with epoxy-yes eventually unless you fix the chip. Bare metal is bare metal-it will rust, rust will continue to grow if exposed to the elements that feed it. Epoxy is by far the most durable bare metal primer available and also offers the best protection. Wax based coatings also work well for saturating seams and sealing them from the elements. If you sandblast a rusted door seam and prime and paint it will come back to haunt you if the corrosion is allowed continued growth from exposure inside the door-the seam needs to be sealed from both sides regardless of what products are used. Submerge a piece of metal in a sealed container of motor oil and check it in 50 years-think corrosion will form? try it with a rusty piece of metal-think the corrosion will continue to grow? All you can do is your best. For some people rust repair is only cosmetic with no attention to preventing it's return or growth. The doorskins I install should last for 50+ years IMO, some bodyshops have their skins popping in less than a year...
 
Thanks for the response bob, makes sense. Do you or anybody actually remove a skin on a door just to sandblast the inside and reinstall the skin? Yeah it would be a lot of work' maybe worth it??
 
I've done it but wouldn't recommend it! If a seam has rusted to the point of swelling it will usually need some metal replacement or a complete skin if available.
 
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