by TomH » Fri Feb 15, 2013 3:12 pm
I don't know if this will help you or not, because I am not an expert and your casts look really good the way they are, and everyone does it different. I extend the clay outward about 1/4" outward from the wheel houses instead of flush with the fenders. When I turn it upside down to cast, the extensions support the inside plug from sagging and making the top of the car too thin. I don't know if you have that problem, but I did and it fixed it. Another problem it helped were voids in the edge of the cast because of bubbles. I was able to cut away vent holes in the plug with an exacto knife at the problem areas and the extensions would support and index. I would pour in the resin and drop in the plug and the excess resin would squish out of the vent holes I cut. I would then be able to trim off the excess after the resin dried. You have the similar thing going on, your windows are keeping the two halves apart. The pressure vessel will help a bunch. I found it helped my silicone molds the most, but I used it for resin also. I was using a smooth on quick setting resin, and Mold Max 30 rubber for most of my stuff. I see now on smooth on's website, they want ya to post cure it a 150 degrees for like an hour and a half.