Step 1: Gelcoat. I've applied gel coat to the top of k9's head where I plan on putting the fiberglass. Note, I've included the sides where I'll have a lip. That'll make it easier for me to have good edge definition once I have the mold complete.
Step 2: Fiberglass application. I've shown two layers of fiberglass here. One layer of fiberglass cloth with a layer of fiberglass mat. For both materials, I use tools that are essentially spatulas to spread the resin into and across the material. I waited a little over an hour between applications.
Step 3: Demold, and touch up. At this point you pull your original out of the mold. If you didn't do a great job with prep this can be challenging. Like it was here. Note all the gel coat that stayed on the model. I didn't have this happen the first time through. >shrug<>
I'll be sanding the mold this weekend and hopefully I'll be able to cast a suitable top piece of the head with what I've got.