I recommend the following finishing of your unpainted canopy:

• Sand the center seam with a block and 100 grit paper.  
• Sand the entire canopy with 220 grit paper to remove all gloss - use it wet - do not use a block.
• Smooth over the center seam with a lightweight fiberglass filler like Evercoat  (available at most auto paint stores).  When cured, block sand the seam with 220 paper wet.
• Spray on a couple of coats of automotive primer.  Let it dry.
• Spray on a light 'guide coat' of black lacquer.  Don't worry about getting good coverage.
• Sand all of the guide coat off with 220 wet.  You will easily see your low spots using this method.
• Repeat the priming, guide coat, sanding process (usually several times) until there are no more low spots.
• Sand with 400 grit paper - wet.  Yes, the clearcoat will easily fill in the sanding scratches.
• Apply your first color coat - a light coat first just to get the surface sticky, then follow with one or two 'wet' coats.
• Mask and spray all color coats, following the paint manufacturer's drying times.
• Apply any graphics.
• Clear coat with automotive clear using the same method as above - light coat, let it get sticky, wet coat, let it get sticky, another wet coat.  Do NOT use the clear coat you get in spray cans.  It will yellow and is NOT fuel proof!

OR, you could just let me do it for you!