After the grain fill you need to seal the wood before you apply any paint or in a couple of months
You will find your paint will sink into the grain.
Second : you are applying far to much paint process to your guitar.
Seal / etch / very thin white primer ( not filler primer )
Only clear coat over metallic or stain as your base colour does not need clear it to can be polished with out clear.
Sanding paint coats to 600 to 800 gritt.
Too many coats of paint just kills your tone and is un necessary.
Also metallic has what is called a flip in the paint, keep in one direction and over lap each line by 50%, only two thin coats should be needed.
Keep you coats super thin ( they cure quicker and more effectively, and if it’s Acrylic or Nitro leave it two to three weeks before you polish it.
Sorry to butt in bro but I had to correct a few things.
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