Cyberpunk Mx5 - Laying the Fiberglass (Patreon)

I finished off the shape (decided to fill and sand it a bit more since the last update) and then masked off the car and gave it a few coats of Polyurethane sealer to stop the fiberglass from sticking to the plug.After getting a good glossy finish I left it 36 hours to cure and came back and brushed on a thick coat of the PVA release film and started laying up the skin coat.Since I'm building this part essential backward from how you would normally fiberglass, the exposed fibers will be on the top surface of the part. You can see how much texture they have and this would have meant both a lot of sanding to flatten them down and also a chance that these fibers show up through the body filler and primer.That's why that when I laid down the main layup of 450's for my final layer I went over the whole roof with a layer of my lightweight fiberglass tissue which helped soften some of that thicker fiberglass texture.I really wanted to keep the heat down on this part to prevent warping so I did the layup in 3 passes. The first pass was the 225 gsm skin coat, then followed by the second layer of 450 gsm and then a third layer of another 450 gsm and the tissue on top, letting it cure past peak exotherm between each layer.Hopefully building it up slowly has kept warping to a minimum but we'll figure that out for sure when it's time to remove the roof from the part.There is over 10L of resin in this roof. I spent over 9 hours fiberglassing alone...I finished up with another layer of 450gsm because I didn't like how thin it was looking and I wanted to be sure that there wouldn't be any warping when I removed it from the plug so I left it around 48hs to fully cure up.I had to cut a line along the tip of the spoiler as the overhang meant that the fiberglass was mechanically trapped to the plug. No issues though because these sorts of spoilers are usually made in 2 pieces glued together.In addition to gluing the spoiler I'll also be filling it with foam which should add a lot of strength and stop it buckling if anybody rests on it. I also added an extra couple layers of glass around the outside of the spoiler right on the wing tips where the glue wasn't going to hold them strong enough.But while I waited for that glue to dry I started removing the plug.And then with that cleaned up I started trimming down the roof. The marks I left on the PVA coat gave me a good guide to cut to but there was a bit more finagling to get it fitting the way I wanted.Finally time to set the finished fiberglass piece on the car and see how it all fits.The seam on the spoiler came out pretty good. No airbubbles or gaps and the shape still matched the curves like I had planned. With the foam core as well it was surprisingly solid.Next up will be working on the louvers and I also plan to come up with a better solution for the door seals on this one, I'd like the finished fastback to be completely waterproof just in case I ever wash it.