The
glass will always take up the mould texture if it touches. So start
with smoothing the mould itself. You can do this by wrapping very
fine wet and dry sandpaper round a flexible sanding block. You can
use this wet or dry, although wet is more healthy. When you get the
desired surface texture you can let the mould dry or immeidately
apply kiln wash. When this is dry you can again sand the kiln wash
but with dry paper only this time and very lightly. Alternatively
you can ball up nylon stockings to provide a soft abrasive action. If
you sand through to the mould surface, simply apply the kiln wash
again.
You
can minimise mould marks by slumping at the lowest temperature which
can achieve the slump you want.
If
you want to avoid mould marks altogether, do an aperture drop and cut
off the rim. There is no mould contact with this technique, so the
glass retains the surface it had in fusing.
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