I have a painted wooden end table that I want to mosaic on for my daughter. I have lightly sanded the top and the legs will be painted to co-ordinate with the top when finished. Do I need to do any special prep to the table top so the glass will adhere better? I will be using stained glass because it will be used as an end table so I need a nice smooth surface. My thoughts are to use Mapei thinset to adhere glass. Any other suggestions on what to use to adhere with? Is the pre-mixed thinset better or not a good choice? Got till Christmas to get finished! Wish me luck, cause I'm going to need it. I'm hoping I'm not biting off more that I can handle, but I know I will get some excellent help here.