>> It is tempting to just fill the low spots with a second
layer and start sanding again. Don't do this. First you almost certainly
will sand into the glass you hit before and second it is very difficult to
"blend" the edges of the second layer with the first layer.<<
Absolutely right. The first layer of sanded micro will absorb resin from
the next so you get a resin rich film at the interface. This interface will
be exposed at the edges of any patches. It is impossible to sand through it
without generating a high ridge.
When sanding use sharp paper and low pressure to avoid distortion.
Graham
|