Right. If zinc chromate won't work, then I will use another primer.
I have used a self etching primer, black in color, from Hammerrite, with
quite a lot of success before on various things at home. Maybe I should
try that one.
Too late for second thoughts, anyway. I have already brushed the existing
coating and surface corrosion, using Nylon rotary brushes to avoid
overheating and scratches. The WAFs are now bare, but not polished.
That still leaves two questions unanswered:
- Which sanding grit,
- Heating or not heating.
Serge
"Mark Langford" <n5...@hiwaay.net>
Envoyé par : krnet-boun...@mylist.net
2005-05-13 21:36
Veuillez répondre à KRnet
Remis le : 2005-05-13 21:35
Pour : "KRnet" <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : Re: KR> Sanding and painting the WAFs
I can tell you for sure that zinc chromate will flake right off the first
time the wings are installed. Mine used to be zinc chromated, but it's
hard
to tell that now! Best thing is to have them plated somehow, like RR
does.
Hydrogen embrittlement may be a concern though, so check for compatibilty
with 4130 first. Here's something I found in a quick search of the web:
"One comment is by a guy who overdrilled a spar bolt hole, and then did a
D-I-Y plating job on the bolt to bring it back up to size:
>Here's what worked for me: I contacted Caswell Plating
(www.caswellplating.com) and bought an 8oz. bottle of their CopyChrome
nickel plating solution. Following their directions, I plated the bolt up
to 0.377" then baked it at 400° F for 4 hours to take care of any hydrogen
embrittlement. It worked great. I also plated some 4130 scraps and was
pleased with their appearance. The plating looked like it should be
pretty
durable. I even soaked a 4130 piece in saltwater overnight and saw no
effect. It's not quite chrome, but it
looks pretty good. "
Mark Langford, Huntsville, Alabama
see KR2S project N56ML at http://home.hiwaay.net/~langford
email to N56ML "at" hiwaay.net
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