Pin holes in paint - The pin holes are called solvent pops. There was still oily residue down in
the fiberglass that was brought to the surface by the paint solvents. Next
time sand the hood back down to the fiberglass and wash the surface with TSP
cleaner and hot water. TSP is available at hardware stores and paint stores.
It is used to wash the oily kitchen walls and surfaces before painting. Bake
the clean hood in the sun  or paint booth for complete drying before sealing
with PPG DP48 white epoxy primer. Then prime with filler type primer, wet
sand and paint.
Paint Problems - 
New paint/won't hole shine
 sorry to say you cannot keep it shiny ,it was 
painted wrong and you are getting dye back ,the paint went on too dry 
and too humid and won`t ever hold gloss no matter what you do ,the 
only solution is to clean the surface remove all wax and grease 
sand ,seal it with sealer and prime over it and repaint.