newbie wrote:
a) Would I be able to see the spacers or would they now be hidden by
beading?

They'll be hidden.


b) Would I be able to see the sealant on the inside or could it be
hidden also?

It'll either have been civered by the beading, or there'll be a line
of it applied where the bead meets the glass. I'd expect you to be
able to see it here and there. Some people don't put sealer around
the inside - if the units are that thick there may well be no problem.


c) I have older (12 years) cottage windows with =8mm double glassed
units, which I am looking to gloss; they appear to have been sealed
with brown putty (or putty like substance) both inside and out. To get
a clean line between frame and window, I was thinking of the removing
glass and replace it after glossing the frames - could I use the
sealant on these. Is the clear sealant a relevantly new thing?

Clear has been around for ages. It may not be the best "colour",
depends. I shouldn't take the beading off, but get a "glass scraper",
a metal handle that holds a retractable single-edged razor blade.
Make sure you get one of these, not a plastic one, or one that uses
a Stanley knife blade. About £6 + a few blades. Paint the window, &
when it's dry, use the scraper to chisel off paint from the glass,
leaving a dead straight margin lapped onto the glass. Don't leave it
too long before you do this, or the paint may chip; too soon, and
it may smear. few days should be OK.