Repairing cracked fiberglass top

[fun in dirt]

The weather has gotten cool & rainy enough where I need to start thinking about repairing my junky hard top laying in the back yard. I just finished reading "Basics of Basics" Fiberglass repair by Brian Martin from an old post to get an idea of what all is involved. But I have 2 questions:
1.) How long do you let each layer of resin & mat set up before applying the next?
2.) How do you get a good starting foundation when you can't get to the backside to make a "mold"? I have a single wall top, but some of the cracks are in the corner where it is kind of double walled Does this make any since?
Okay, maybe 3 questions...Is there a post that shows picture steps of a repair? I've searched but don't see anything.