Hello Jeanpaul.
I have always used "Milliput" a two part epoxy putty, you can get it from most craft type shops or on Ebay through "Ancestral dawn" they are very good price wise, and always been very fair with me.
Some of the other guys have used tile adhesive and got very good results also, in fact I have now tried this and it is a very fast way of doing it.
Hope this helps out.
Kind regards Paul.
