Imagine a small round hole and imagine me trying to fill it.
I apply filler to my spreading device, force some of it in to the hole
leaving a bit proud above the surface, then wipe with the edge of my
spreading device to remove the excess.

Now, say I wipe from 12 oclock to 6 o clock....why do I always end up
with a recess in a line above 1030 and 1330 where the filler seems to
get "pulled away" because of its viscosity?

Clearly my technique is wrong, but why?

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