Here is the repair sequence of one of the more common rust repairs that this product excels at - rust in the wheel wells. In fact, doing the repair this way is better than trying to weld in new wheel metal. Have you ever witnessed how rapidly welded steel can rust? If you cannot get to the back side of a new weld to treat it will a product like miracle paint it will rust out again from the backside in 4 to 8 years if it is exposed to moisture.
Here is a typical rust spot that you might find in a wheel well area. Doesn't look to bad does it... just remember what you see is always the tip of the rustberg.... This is n example of why I detest body undercoating. It allows moisture to get trapped in behind the coating and actually accelerates the rust out.
When you start scraping away the undercoating and flaking metal, the hole will always be worse than what you first expected.
Once the damaged metal has been fully exposed you can continue scraping and rough sanding the surrounding metal to an area at least 1 to 2 inched past the weak metal.
Coat the area inside the hole thoroughly with Miracle Paint to prevent further rusting, then make a patch of 3 layers of fiberglass mat soaked in Miracle Paint and apply it over the rust hole. When dry overnight you will not believe how strong this repair. Even banging on it will make you think you are banding on sheet metal. It dries as hard as epoxy but will not let loose from the rust like epoxy or polyester resin. It really is a miracle!
When the Miracle Paint is dry you can skim coat it will a water proof filler, sand the area and then spray it with our high quality chip guard (do not use typical auto body undercoating. Massage it a little and you can even make it look old and original. Complete details on how to do this are included in this advanced rust repair manual.
On another note this product works great on repairing holes in mufflers and rear exhaust pipes. Just try to find ANY other product that can do that and have it last. I have done repairs on mufflers that have outlasted the life of the muffler itself!