: I tried
: to lay the glass after the seal coat is tacky, it wouldn't work
: so well to get it spread out nice and flat. Any advice?

For some one new to fiberglassing, YES. Wait about 12 hours until the epoxy isn't tacky any more. It should still be "green" and slightly soft. Scrape off any ridges and or bumps (ie bugs or dust nibs). Don't try to sand it. Your 'glass will slide on top fine.

A much more advanced method is to roll on a coat of epoxy, wait for it to get slightly tacky (usually a couple of hours with fast hardener), lay your 'glass on and immediately start 'glassing. You want it tacky so that it holds the 'glass in place. It works really well on interiors and is also a way to reduce resin usage for light builds. I often use it when casting parts that have a clear epoxy gel coat. One big warning: It can also be a royal PITA!