Ah fair enough then, I did not read the full post. Any time you use coarse paper the fine scratches need removing by moving up the grit range. 2000 grit does not feel like much but it does work......but it must be used with water. Soak the sheets beforehand for 10 mins and use a water spray whilst working....inspect regularly.It's an art to be honest Just as a side thought some people have had really good results using just a high build primer without trying to sand out.