In article , "David
Lang" says...

"ben" wrote in message

How so? to get it level you just tap it with a hammer in places till it
becomes level using a Spirit level.
Battons are adding to the work load.

So what if, on the second sheet you have a bulge in the wall - not uncommon.
If you level it one side, you can't level the other. Third sheet becomes
worse.

Use big enough dollops that you *can* level it.