i second Scott's advice...but also...
i've found the palythoa/ button polyps to be pretty tough at their base and they seem to glue pretty easily, just blot them down real quick with a paper towel and use no more glue than you would need, if it winds up sliming over you probably used too much
as for other soft corals, and this might work for shrooms too...to overcome the slimyness...i have taken plastic tooth pics(broken down to size), stuck them horizontaly through the base, and then glued the toothpick to the rock work
HTH