how much paint should I sand to blend new paint?
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- This topic has 3 replies, 2 voices, and was last updated 10 years, 12 months ago by Ben Hart.
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- February 22, 2014 at 10:35 am #45929
Hi, I have never painted a car before but I have painted small plastic parts before and also I painted a car spoiler before. So I am kind of new to this but I do have some experience.
My uncle hit a snow bank with his car a few days ago and he is going to have me try to fix the damage. It is a very small amount of damage, the bottom of the fender cracked. so I sanded the area around the crack and used some 3M epoxy to bond the crack.
I am going to add alitle boddy filler tomorrow, but if I have to do any more sanding I was going to also do that tomorrow. also.
I was just looking for advise so if anyone can give me any I would appreciate it. I am painting with sherwin williams ultra 7000 paint (tri coat)
In the attached photo you can see the area that I put epoxy on, (shown by the red arrow). I was wondering if I should sand within the yellow circle (just around the damage) or if I should sand and repaint a larger area, such as the area around the green circle?
Attachments:Welcome to the site.
What most of us would have done is removed the bumper. If the plastic was cracked through, you would need to do a double sided repair with the adhesive ( or alternately, plastic weld it). The adhesive doesn’t stick well to paint, so the pant would have had to be sanded off, the damaged”Veed” out and adhesion promoter applied to the bare plastic. The repair on the inside of the bumper should be used with mesh for added strength. The adhesive/filler on the outside could then be blocked, followed by an application of adhesion promoter then flexed 2k urethane primer surfacer.
At that point, the primer would be blocked smooth when dry, then the bumper could get prepped for paint. Most professionals would blend the colour along the bottom (or apply basecoat to the whple bumper) then clearcoat the entire bumper.
If you are trying to stay within the area you circled, you won’t have much room to blend the 3 stage and blend out the clear coat too. That would be a very difficult task.
February 23, 2014 at 5:13 am #45943thanks for the feedback. So how much extra “surrounding paint” would professionals sand to properly blend the tri paints? Or would they sand the entire bumper when it was removed?
The whole bumper would be sanded once removed. Sanding it with 600-800 and a grey scuff pad would allow you to blend where needed, and clear coat the rest of the bumper.
Tri-stage paint takes more room to blend (since you are blending the ground coat then blending the mid coat beyond that). As a general rule of thumb you need about 18″ to blend a tri stage (although someone experienced painters could get away with less in some circumstances).
What clear are you using the the Ultra 7000? The HPC21 might be a good choice
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