If you see clear lines then the mortar is too dry.
How to install stick up tiles to wall.
For the average small wall tiles which are currently popular you will want to use a 1x4 square notch trowel.
Then place the tile directly up against the first tile.
Peel and stick the tiles when you re ready to begin tiling line up the tiles with your layout lines remove the backing and press them into position.
Flatten the tile with a grout float if necessary.
Tiles that have a directional pattern feature an arrow on the back so you ll know which way to orient them as you lay them down.
I simply cut the wood to size mitered the corners on a 45 degree angle and applied them to the wall with a nail gun.
Test a tile to make sure the mortar is mixed and spread correctly.
Take the first tile and press it onto the wall in the area where you made your marks.
Then take another tile and peel off the paper.
Pull the tile up and look at the pattern that is create on the back.
Slightly rock the sheet up and down perpendicular to the trowel lines to collapse the ridges and help the tile settle into place.
I used a wood trim instead.
Be sure to line up the tile with your penciled layout to get the placement right on the first try.
How to stick tiles to the wall 1.
Scrape the mastic with the notched side of the trowel.
Start at the top or one end of.
Mortar a small spot and then place a tile.
To finish off the edges of the tile smart tiles sells a finishing edge that sticks to the wall just like the tiles.
Place the mosaic sheets along the wall.
Spread mastic generously over a section of the wall that you can cover with tiles in about an hour using the flat.
However i decided to customize the look.
Press it firmly up against the wall and make sure that you hold it for a few seconds to allow the adhesive to stick to the wall.
For most tiles the depth of the notches should be.