Debbie, I think using Wet Seal that Chris uses will be best.
NOTHING was sealed in this backyard where I painted all over the place:
I painted all of this on concrete, outside, and it was over 5 years when the client called to have me refresh it. I personally liked it like it was, faded and soft but the new color was eye popping too. It's been 8 years now.
I always use Krylon on the bricks but I'll seal the entire thing with the Wet Seal instead from now on.
I am half way finished and will complete them tomorrow and post Monday night when everyone is sleeping.