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Clean your aluminum parts after sanding with 1200 grit crocus cloth (for
bare Al and clad).  DO NOT go thru the cladding on alclad!  Clean with soap
and water like 409, etc.  Rub hard with a soft cloth using phosphoric acid
(AlumaPrep) until water sheets... no beads allowed.  Rinse well and alodyne
using fresh mix.  Alodyne will die with age and contamination.  The part
should turn gold in just a minute or so.  Do not rub the part as you will
rub off the powder coating the alodyne leaves on the metal.  Alodyne's
purpose is to help paint adhere to the metal.  Rinse well and dry
thoroughly.  Prime with two part epoxy primer containing zinc chromate
(DuPont Variprime 625S).  Top coat with two part urethane such as Imron.
Your parts will have ten to fifteen years life before filiform corosion will
set in.
Or, find someone to anodize those six foot pp tubes...  By the way, etch and
alodyne pp tubes inside and seal them with paint or proseal so water cannot
get inside.  That is how it's done at the big boys on C and D checks.
Walter Dodson

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Please send your photos and drawings to marvkaye@olsusa.com.
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