the most likely problem occured when you used the degreaser.your second problem was you sanded too fine. to prep a boat for paint #1 clean with degreaser,#2 wash the heck out of it with fresh,(filtered is the best) water,,alot,,,after you think your done rinsing,,rinse for another hour,#3sand with 220( im not familar with your paint,,i use Awl-Grip, and if you use gel-coat procedure is different), #4 blow off for as long as you rinsed,#5 dampen a rag(not wet,,i soak rag then flop it around in the air till jus damp NOT WET )with denatured alcohol and LIGHTLY wipe down entire boat,#6 prime,least 4 coats, THIN coats alwaYz better,#7 sand with 320 grit,,sand ALL shine awaY, #8blow off again,,twice as long as last time, #9 wipe down with alcohol again( remember when you wipe that you shouldnt be able to see ant wet steaking at all)#10 dont let ANYONE touch, smoke,cough, or breathe towards boat after you have sanded primer,#11 spray top coat then clear. I dont know about the wet sanding after, i've painted yachts for over 15 years and have only had to wet sand small mistakes,,never a whole paint job, thats why a clean damp dust free enviroment is best for a GOOD paint job, and less work

when you sand too fine the paint doesnt have enough "hold" and will spider ar just peel off after a short time