Anything made by 'Perma-grit' tools, yes expensive but highly recommended (especially large aluminium sanding blocks),
the grit stays razor sharp for many years.
My modelling/DIY skills improved, gaining a higher level of finish and accuracy after buying Perma-grit blocks and files,
I would be lost without them.
Yesterday's decorating/DIY - used my aluminium sanding block to adjust mitred angles on delicate
Kraft paper skinned polystyrene ceiling coving, the blocks rigidity and sharpness enabled sanding this strange modern product
to a beautiful crisp edge without tearing the paper surface - wonderful kit !
Ideal for the diffficult job of shaping model boat hull hardwood chine/deck stringers -
again the sharpness slicing through spruce etc very easily.
Paul