Learn Auto Paint Prep Sanding and Discover...
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How to sand your existing painted surfaces & get them ready for new paint. |
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How you can optimize your auto body sanding efforts. |
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The importance of using extra fine auto finish sandpaper ...and more. |
It's guaranteed that once you have completed any necessary bodywork, prepared the surface for paint and wet sanded the finished surface; you will know the body of your vehicle, project pretty well.
Never think you can sand too much or get the surface of your vehicle too smooth, this will rarely happen. It is possible to sand too deep into the underlying layers or leave an auto body sanding pattern or groove behind leaving a wavy uneven panel. DO not make these mistakes! See how to master this skill by joining the club!
Important Considerations for Ensuring Optimum Results when Sanding Auto Paint
When you're sanding auto paint, it would be wise to use a the proper sanding block for the size and shape of the project that you are working on. For example, you wouldn't want to use a flat block in a curved rounded area of the car.
To avoid sanding grooves and any other deformities occurring on the surface of your vehicle, you should sand in every different direction that you can think of, changing your sanding direction every few strokes. Zig-Zag etc...
Anybody can pick up some sandpaper and get busy sanding auto paint but it is a little more skill to it than that.
Auto Paint Prep Sanding on Existing Paint Surfaces
You need to always make sure that you scuff old paint surfaces before you apply any new paint; not doing this is a big mistake.
The purpose of scuffing is to dull any shiny surfaces so that any new layers of paint material will have something to adhere to. This is even more critical if you're dealing with a factory paint job that was baked on at approximately 450 degrees Fahrenheit.
By not scuffing paint surfaces the result will be that your new paint will flake off because it has nothing to bite onto when adhering to the surface. This is the job you get when painting your car at Macco. You get what you pay for and I think you can personally do a better job than that.
A fine grade Scotch Brite pad will work but I like to use the basic 400-600 grit paper. They leave behind a smooth finish that works well for fresh new coats from your paint system to adhere to effectively.
Getting the Surface Smooth
Prior to the painting process, you will need to work at getting all of the repaired body panels as smooth as is humanly possible. You can only accomplish this task by auto paint prep sanding any areas that feel rough. This could be a small area or the entire vehicle.
Take a slow walk around your vehicle and pay very close attention to the surface, use your hands to feel your way around; you finger tips may pick up on something that your eyes don't. The VIP Membership Course will take you by the hand and show you EXACTLY how to do all of this on videos.
Any imperfections that you discover at this point while in primer or scuffed paint is going to be magnified once you add new paint. Paint simply won't smooth out the finish, although it will fill in light sand scratches.
The only way to smooth down any rough textures is to block sand the area that still feels rough, whether it's a small area or the entire vehicle.
Fine Auto Finish Sandpaper
After you have finished using say 400-grit sandpaper on your vehicle, some auto paint prep sanding scratches may remain that will show up clearly when you paint over them. These will need to be taken care of with higher grade fine sandpaper such as 600-grit.
If you require an extremely elaborate paint job finish, try block sanding the entire vehicle using 800-grit. For the greatest results, steadily work your way up through the grades of sandpaper.
Please note that if you went from 400-grit to 1000-grit fine sandpaper, the process is going to take you much longer than it should, so allow each grade to do its own individual work.
Using Finishing Putty
For any remaining imperfections such as slight pinholes in body filler or extremely minor scratches, fill them using finishing putty.
Finishing putty is thicker than primer but thinner than body filler. It comes in a squeezable bottle and is mixed with a hardener and is applied with a small body filler spreader.
Finishing putty should only be used on the tiniest imperfections, so only a small amount is needed. Follow the product guidelines for the correct drying times and then use the appropriate grade of sandpaper such as 400-600 grit paper.
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