On Wed, 04 Aug 2010 22:54:27 +0100, Tim Watts wrote:

It *will* be OK.

Even those that sound hollow when tapped?

It is a bit odd that the adhesive hasn't set, is that sealer rather
to effective in not letting the moisture in the adhesive into the
wall?

It may also be technique when offering the tile to the wall and
setting it into position. Place it in the right place the finally
push into position with a slight twisting motion, final small (much
less than 1mm) tweaks onto the spacers (if using) without the twist.
A tile should be firm onto the adhesive and be very reluctant to move
after a very few minutes.

--
Cheers
Dave.