Progress report...mixed results and more to do than planned.
The idea is sound. gap reduced from 0.004"+ to 0.002" in remaining area in about 20 minutes.
Unfortunately the spray adhesive did not hold paper to mirror very well.
That is a minor set back as the method is now proven to work.
The two halves of tank did not match up as well as hoped.
Bottom half flange is also warped.
Not a serious problem, just more figure 8 time.
400 grit Wet or Dry leaves a nice smooth surface finish.
The problem of sticking Wet or Dry to glass seems solvable.
Top half of tank done. Sharp eyes may notice a bit of blue left
OK 0.0015" feeler gage will not fit between flange and surface plate.
Bottom half tank flange is seriously unflat.
220 Grit Wet or Dry gives a very good surface finish.
Gasket stock used for resealing tank is 1/32 " or about 0.031
Top and bottom tank flanges do not need to be perfect just so long at surfaces
are relatively flat and parallel enough to clamp gasket fairly evenly.
Interesting project and not forever and a day to do.
Using only 2 sheets of Wet or Dry instead of covering mirror with sand paper
made figure 8 out of question, but, the paper stayed flat much longer and
more economical with paper.
Note: the smaller the blue area, the more of the larger the remaining are that needs
to be reduced....sort of the closer you get to finish line the farther away it gets.
Note; it seemed helpful to sponge off grit on Wet or Dry and sponge on water
Thanks for comments and interest in old school technique.
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Last edited by green thumbs
on Fri Mar 02, 2018 5:53 pm, edited 2 times in total.