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04-28-2011, 07:36 AM
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Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,188
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Acid Etch for 410 filler?
Should I acid etch the alumimum prior to applying west systems 410 filler? If so where can you find acid etch locally.
Thanks,
Andy
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04-28-2011, 07:58 AM
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Join Date: Mar 2006
Location: Evansville, Indiana
Posts: 661
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On mine, any aluminum that got filler was cleaned with Dawn and maroon scotchbrite pad followed by acid etch and alodyne. No filler has fallen out so far 
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Steve Eberhart, W9JUQ
3EV - Evansville, IN
Where is Steve and the Sky Terrier?
RV-7A Slider, O-360 A1A, Catto 3 blade, 2 screen Garmin G3X Classic, GTN 650, Bionics APRS. FLYING since June 24, 2009
EAA Chapter 21
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04-28-2011, 03:32 PM
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Join Date: Jan 2005
Posts: 269
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Acid is ok but I would be more agressive with the Scotchbrite, I used 60 grit paper.
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Adam Silverstein
Technical Counselor Chapter 643
Flying RV-8 10/30/07
PAID 2021
Pittstown, New Jersey
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04-28-2011, 05:36 PM
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Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,188
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Prior to sanding I wased with soap and water than sanded with 60 grit, washed with soap and water than acetone. As I was sanding the fiberglass down, there was one section of fiberglass over the aluminum that I ended up peeling off with a putty knife. Possibly it's my cleaning, half the parts I wiped with acetone and papertowels until the towel came away clean, the other half I just wiped down once with acetone and paper towels.
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04-28-2011, 05:53 PM
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Join Date: Jan 2008
Location: MERRITT ISLAND, FL
Posts: 360
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Where's the etch?
[quote=crabandy;537517] If so where can you find acid etch locally.
I found the metal prep (acid etch) at our local automotive paint stores.
Don
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Don Stiver
RV8 "Little Pill" N6371S, Merritt Island, Fl.
BPE IO-390, Dual P-mag, MT 3-blade, AFP system
Steen Skybolt: Sold
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04-28-2011, 07:01 PM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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Did all my tip work by sanding with 80 grit, blow air, grease and wax remover and apply, worked great! I used west systems G flex resin,
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7A Slider, EFII Angle 360, CS, SJ.
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04-29-2011, 06:23 AM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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I ordered the 860 acid etch kit from
Jamestown Distributors.
It improves the bond strength and helps prevent corrosion which can form at the metal/epoxy interface. Corrosion can cause a weakened bond down the road. I used it for some but not all alum/epoxy bonds. Mainly on winshield base fairing as it was recommended by Van's here. Here is a link.
http://www.jamestowndistributors.com...t.do?pid=12214
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