I have been using ceramic resin with good success for years, but on a recent project had a big problem with parts not adhering to the build platform, and completely falling off during the print. I prepared the platforms as instructed with sandpaper, carefully cleaning, making sure the platform was not cold or contaminated with anything before the print, etc, but still could not complete a 3 hour print without the part detaching.
Here’s what completely solved the problem for me: I prepared the build platform with sandpaper, and cleaned with alcohol, then dipped a small piece of paper towel in plain clear resin (eg from a nearby tank), and used it to spread a very thin layer of clear resin on the platform. I used enough to make a coat of resin thin enough that would stay in place when held vertically – like painting the wall of a house. Then, I put the whole platform in the curing machine for 5-10 minutes at 40*C. This mostly cures the resin, but it will still be tacky, and also ensures the platform will be warm. No more adhesion problems! After the print, I clean the platform by scraping it with a single-bevel end-cutting Xacto blade (looks a chisel), then sandpaper. If I know that I’m only going to print with the center of the platform, then I only do this treatment around the center area. Good luck!