Hey man, the transom looks great!
Couple things.....
I always make “hairy” peanut butter. That is adding 1/4” chop to the mix. This reinforces the PB and will prevent the thickened resin from cracking, especially when you lay on the PB thick, like fillets. Cabosil is a great thickening additive, but offers zero reinforcement, and polyester resin chemically has no binders to prevent the cracking, hence the reason we use CSM in poly layups. Mix the hairy PB by pouring resin, add cabosil until it’s just about mayonnaise, add a few pinches of 1/4” chop....mix well. When you get the consistency what you want, add the MEKP at the desired ratio. The chop strands will help mix everything to the same consistency which is why I add them before the MEKP.
Getchya some disposable pastry bags for doing fillets. You can dump the hairy PB in the bag, cut the tip of the bag and use it like caulk. Some guys use a spoon to tool the PB into the shape of a fillet, I just used my thumb while wearing a nitrile glove. The goal in the fillet is to make a cove so the CSM or 1708 will transition easily in those corners. You might say rounding off the corner. Glass does not really like edges and sharp turns.
When the fillets are hard, run your fingers over them gently with a nitrile glove. Anything that pulls the glove needs to be sanded, and smoothed. I found that if I use a chip brush and paint a thin coat of lightly thickened resin without strands over the fillets, it greatly smoothed out the fillets and made a much nicer layup.
I have subscribed and will be following along to offer whatever help I can. You’re doing a great job thus far. Way to go!!! It’s not an easy task, but you’re plugging away nicely.
sorry about the mess I didn't clean up before the picture.
