Fixing Orange peel in sealer coat

Today i sprayed 2 full strength coats of epoxy on my truck as a sealer. Tomorrow i wanted to shoot base but i got some bad orange peel in one small spot. Whats the best way to smooth it out? 400 grit on a dura block?
 
Thank you. I should of started this project on the smaller body panels first there wouldnt of been so much prep work between painting sessions.
 
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