Hi guys. I will tile my bathroom next week and i do not like using trims for external corners. I have a wet saw that can be tipped 45 degrees and i would like to cut the tiles for external corner 45 degrees. Once the tiles join up, there will be very sharp external edges and therefore i would like to smooth them down. Will i have to smooth the edges of the 45 degree cut tiles with sand paper one by one before i lay them on the wall or after i have laid them all on the wall? And will fine grade sand paper be suitable?....i have got a roll of fine aluminium oxide abrasive sanding roll. Thanks for your advice.