Dust free environment, apparatus and product are essential. use a 400 micron filter at least for paint and thinner
fast dry products help minimise dust attraction upon drying.
not all products are designed to be polished.
light coats better than heavy , but product needs to 'wet out' not to be sprayed dry or sparingly but always evenly
different spray apparatus may require change to paint viscosity which affects ability to wet out.
use thinner only until product produces the micro misting as per spray design , spitting or orange peel finish means add more thinner, dry spray or lacking gloss means less thinner, experiment with ratios on test panel and mix and fliter enough product for full coating
weather is a factor but may affects drying time and not finish , what kind of product are u using ?