Could someone help me with orange peel?

what you are getting is not orange peel.  Orange peel occurs when Clear Coat does not atomize properly (too much or not enough air is mixed with the clear at the tip of you spray gun).   It's not really possible to get out of a spray can.  The reply about incompatible products if correct.  It sounds like your primer or base coat or both is a lacquer base and your clear may be Polyurethane base. 

Buying an air compressor a gun and real polyurethane base product can get very expensive.  You can get an okay finish with spray cans.  Try sanding it down make sure you remove everything.  Sand project to 400 grit. Clean with a prep-sol or similiar product.  Use products that are all the same brand.  Primer, base, and clear.  (ie.  krylon,  plasticoat) 

**note  always pick a flat base****

even if the cans are not labeled with what they are based with normally if you use the same brand they are made the same.

Wet sand primer with 600-800 grit

apply base 2-3 coats let dry 15 minutes with most flat paints 70 degree weather

wipe with tack cloth

apply 2-3 medium wet coats of clear  allow 5-10 minutes of flash drying time inbetween coats again about 70 degrees is good

be carefull not to run the clear.  If you do it not the worst after 48 hours you can wet sand the run with 2000 grit paper and buff haze away with a rubbing compound.  That goes for any bugs, lint or dirt that tends to find its way on your project.

hope this helps I've been in the same place many times.

  this had happened to me not to long ago.what ur problem is that a chemical in one off ur primers or paints didnt mix very well with the clear coatt hat s y i try to stay with a good brand and stay with it.what i did to fix this was start all over.sand it back to just about the bondo or resen and do it once again.hope this helps.