Ok, you have sanded all the rust, filled it with fill and have painted it and you are satisfied with the repair of the rust removal. A few weeks later, you go out and notice a bubble on the painting exactly where you did your repair and you have to start from scratch. How can this happen?
Well here is the main reason:
Preparation. This is the most important part of the rust removal process. If you do not get this right, the rest of the repair will be a disaster. You must first hide the area you do not want to touch. It's tedious but if you want your repair to be professional, then it's a must. Use duct tape and brown paper. Then grind or screen the rust until you are back to the shiny metal. Now, it is there that a lot of rust removal repairs are going badly. You must be complete.
Even if a rust blackhead has let it spread again like cancer and you will still be back where you were before. If you find a rust blackhead, you do not want to sand it because it will wear down the metal until it is so thin that it will be unacceptable to rust again and that it will not work properly. it goes against the purpose of the original rust suppression.
One way I use to get rid of it is to drill a hole through the center of this annoying point until it's gone. One or two tiny holes made by a 1 / 8th part drill will not cause any fatigue to the panel and you can coat them with a coating after a good brush with rust treatment, the larger holes must be fixed with fiber glass If you sand the panel and you still get a black patch, say it bigger than the size of your sticker, and seek professional advice unless you have access to the proper body equipment and know how to do. the biggest repair.
Assuming that this is not a big job, the next common mistake is the use of body filler. Even some professionals will complete the repair and leave it overnight without being recovered. In the morning they go back to work and spray with the primer and then the top layer. Few know that the body filler is porous and joins the moisture. It will remain invisible and will sleep until a beautiful day when moisture will rise to the surface and lift its ugly head. You will not see it until a bubble appears on your painting.
To prevent this from happening, you should spray the filling product as soon as you can with a protective layer of top coat and sand it in the morning. I even took a welding torch on top of my repair to heat the load and eliminate any moisture. Do not take the chance that it is dry or you will live to regret it.
This is a very brief summary of how to remove rust and make a good long lasting rust remedy. This is not a difficult repair and these tips could save you a ton of money in repair bills. If you want to know how to fix bumps and other automotive money saving tips please visit my car repair site.