Repairing mtk acrylic urethane paint no clear

[CaptainFrame]

Hello,
I'm new to the forum and to autobody and painting. I purchase a 01 f250 truck and the bed was destroyed. I recieved a like new bed in the deal that only required minor body work and paint. After completing the bodywork I applied Omni Mp282 sv primer with no problem and prepared it for paint. Today I began the painting process (Omni MTK acrylic urethane code Z3 silver) and at first had some serious zebra stripes. After adjusting fire I was able to remove the stripes however I noticed alot of dirt on the tailgate and a couple runs on the bed. I stopped, hoping to wet sand the dirt out and repaint. Can someone give me adivise on the proper procedure for repainting the bed. I was advised to wet sand with 400 and re shoot since I let it dry and lost the chemical adhesion. Thank you for your time

[Len]

It's a little late for this but when spraying metallic colors you should use a base/clear paint because it allows you to apply the base evenly without having to worry about the gloss until you apply the clear. This means you don't need to apply the base so smooth and you don't have a big risk mottling and you get a better look of depth to the metallic.

With the situation you have now you can sand with 400 to 600 grit sandpaper (I'd recommend 600) then respray but the risks will be the same. Remember that almost all the dust comes from the car or your clothing so blow these surfaces off carefully and pay particular attention to gaps, seams and parts that can put out dust as you spray. Use a tack cloth to remove the last remaining dust right before you spray.

Wet sanding to remove dust and runs from a single stage metallic can be difficult because the metallic tends to change at different depths so sanding and polishing can change the color the more you sand. These same situations (runs etc.) can come about shooting base/clear but they can usually be solved without having to worry about causing problems with the metallic.

I don't know the working characteristics of the Omni but with the urethane I use I can sand and repaint the next day however inexpensive paint can react with a new coat because it may not harden to the point where it won't react.