Completed all of the drilling, deburring, dimpling and preparation. The next step would be to prime the parts if desired...I don't desire as I will spray biennially with Corrosion X, a much better, long term, solution over priming. I don't have any Pro-Seal on hand, but Van's calls for this to adhere the PVC blocks inside the trailing edge of the elevators and trim tabs. On previous builds, I had talked with Van's tech support where they let me know that they use the fuel tank sealant simply because they have this on-hand, however, suggested that any flexible, fuel resistant adhesive could do the job. I've generally used 3M Super Weatherstrip Adhesive, but had 3M 1099 Nitrile adhesive and Lexel sealant on hand, so thought I'd make a little experiment. BTW, I have avoided using RTV on aircraft for a couple reasons, one, it tends to soften when exposed to fuel and oil, and two, silicone isn't paintable, so not a good thing to use on airframe parts that would be painted. The experiment went well, with the Yellow adhesive being the run-away winner. Lexel is definitely not very adhesive, but is good sealant on acrylic material. I used a force gauge to test, the Level just came away with about 2 pounds force. The 3M 1099 is pretty good, but I was able to break it away from aluminum with about 14 pounds force. The 3M Yellow Super Weatherstrip Adhesive 80001 was still holding well at 30 pounds force, which exceeds the amount of force I would imagine would be a normally experienced by a piece of weatherstrip. The bottom line is that I'm using Yellow for adhering my PVC blocks internal to the elevators. The PortaCool was pricey - but worth every penny!