> I just put the primer on my boat last night, I used Petit brand Hi-Build
> primer that is supposed to dry in 4 hours and then be easy sanding.
> tonight I went to sand the primer to prep for a Brightsides top coat and
> the primer just clogs up my 220 grit sandpaper and makes a mess. Is it
> possible that it still isn't dry ? it was in my garage all night and today
> it was in the 70's all day. CLC talks in their shop notes about not
> letting hibuild primer sit too long so it won't absorb moisture. any
> others with a similar experience ? how long do I wait before I give up and
> scrape it off ? underneath is 3-4 coats of Raka noblush epoxy which was
> well sanded prior to the primer coat.

I just used hi-build primer on my Ches 18 this past weekend. I was very happy with the results. I suggest using 150 sand paper instead of the 220 - the primer will even clog the 150 fairly quickly - but be patient and expect to go through a lot of paper. (You can be fairly confident that your primer has definitely dried) Good luck!!