paint prep

[Dick Blaney]

The aircraft repair stations are using a new method of "blasting" paint from
aluminum surfaces, using ground up polyethelyne plastics, (recycled plastic
milk jugs).  Supposedly, all paint and sureface corrosion is removed without
even leaving a mark on the polished metal underneith.  I haven't seen it
used, but I wonder if this may have some use in rig refinishing.  Anyone
familiar with the process?
73 de
Dick, WB8MHE
wb8mhe at bright.net

-----Original Message-----
From: W. Sushak <stanway at DBLHELIX.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Monday, April 26, 1999 12:14 AM
Subject: paint prep


>Hello...
>Have been watching this discussion with interest.  Have redone/rebuilt many
>electronic and mechanical pieces (from cars on down).  If you are going to
>have paint removed via blasting, consult commercial outfits for information
>if not the work.  Sand and glass are graded as to size and weight.  Type of
>finish desired for any given material is determined and then appropriate
>materials/pressure/volume applied (weight and hardness of individual
>particles of sand are different, even though mostly silica... glass beads
>are manufactured an so a greater consistancy across the board).  I have had
>many aluminum pieces blasted, and have had the finishes I wanted because I
>told the blasting outfit what I wanted.  An example of this is (e.g.
>"fine") glass beading on aluminum chassis' will produce a finish as smooth
>as a baby's rear end.  When I had my boat outdrives glass beaded prior to
>rebuilding, I had them use a coarser glass material because I wanted enough
>bonding area (the rougher the surface, the more surface area) for the zinc
>chromate primer (probably still the best bonding general purpose primer for
>any aluminum, but illegal in many areas now... difficult to get on a
>consumer level except at marine supply stores).  Painting is a system, not
>a single step... someone else on this reflector said that proper prep work
>was at least 90% of not only a good looking job, but a lasting one!
>
>...wayne
>
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