ive never had any probs with the maskol/tape way of doing canopies,however this is a fairly simple canopy to mask, anything more intricate(ww2 german bombers for instance) i hand brush because by the time you've masked all that you could have painted it anyway.yes its filler down the sides and intakes, its simply called humbrol model filler,comes in a tube like glue and takes about 24 hours to dry. there is surface detail, but the primer i used swamped it a little,and its not come out too well in the pics.it a 1/72 kit and will be finished in the colours of aircraft number ZA541 R.A.F.
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p.s. thanks for the encouraging comments