There are several threads on Audiogon about this topic, check the archives. Yes, it works. I wouldn't advise tiles unless they were VERY flat, any uneven surface could risk marring the grooves. I'd rather go for plate glass myself. Preheat the oven to 150 degrees F. (if you can set it that low.) If not, preheat it and then let it cool to that point before putting a sandwich of glass/lp/glass into the oven. Make sure every surface is clean. Just leave it alone and let it cool down for a couple hours before removing it. I'd NEVER do this on a valuable lp without testing the procedure first with a warped junker lp, oven thermostats are notorious for being inaccurate. I've flattened numerous lp's with low heat and never damaged the first one.
