If you so not clean the tile(s) first, it will fall off.

I usually glue the tiles face down on glass then sand flat.
After cleaning up I then glue to the respective board (Foam or MDF or Ply)

By the way no question is basic or foolish.. some answers might be.......

Haydn

Hirst moulds held
40, 43, 50, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 65, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 85, 86, 91, 94, 95, 96, 98, 100, 164, 200, 205, 212, 220, 235, 240, 250, 260, 261, 265, 267, 268, 270, 271, 272, 273, 277, 278, 279, 295, 300, 301, 302, 303, 311, 320, 321, 325, 326, 327 701.


to complete a journey is good. 
to enjoy the travel in the journey is the greater joy.