I just finished using RAKA on my last project and did exactly what you propose. When the sealer coat was just hard enough to not be tacky, I applied the glass and next coat and the race was on! If you keep the sealer coat smooth, it works very well.

I'm just curious as to why you plan to use the 600 series hardeners rather than the no-blush 350. I've been very impressed with it's characteristics. The RAKA literature hints that blush (however minimal) can be expected with the 606 and 610. Is there another feature of these hardeners worth considering?