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05-31-2011, 02:32 PM
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Join Date: Jan 2005
Posts: 3,642
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phosphoric acid for prepping skin for fiberglass
Van's instructions for the windscreen fairing indicate that mild phosphoric acid seems to assist the adhesion of windscreen fiberglass to the aluminum skin. Have others used this and, if so, where does one go to buy it locally?
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Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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05-31-2011, 02:54 PM
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Join Date: Dec 2006
Location: UK
Posts: 368
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Haven't reached that point yet so cannot comment on how effective it is. However, phosphoric acid seems readily available on Ebay. It appears to be commonly used for rust removal.
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Steve Hutt
West Sussex, UK
RV-7 G-HUTY (not flying yet)
( Tip-UP / TMX-IO-360-M1B / Hartzell 7497-2 / 1x LSE PLASMA III / Dual AF4500's / AF-Pilot AP / 695 )
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05-31-2011, 02:55 PM
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Join Date: Dec 2005
Location: Oliver, B.C. Canada (Okanagan valley)
Posts: 786
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Phosphoric acid -
Isn't Alumiprep diluted phosphoric acid?
"Alumiprep 33" ?
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Lorne
RV 7a tip-up
Pre-cover MD-RA Inspected.
Canopy completed. Bonded with Sika-Flex.
Up on her mains, Firewall Fwd and wiring on going.
Last edited by lorne green : 05-31-2011 at 02:59 PM.
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05-31-2011, 03:42 PM
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Join Date: Jul 2005
Posts: 1,341
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Ospho. Available at Home Depot, etc.
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Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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05-31-2011, 05:11 PM
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Join Date: May 2008
Location: central oregon
Posts: 1,089
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coke/ pepsi. Ha ha, just a joke unless some chemist says all hte other ingredients are good
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nothing special here...
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05-31-2011, 05:44 PM
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Join Date: Nov 2008
Location: Missoula, MT
Posts: 714
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No
I didn't use it, just heavily scuffed both plexi and alum. with 50 grit and wiped with MEK. Won't hurt anything though, I have some 75% H2PO4 and played with it on alum. No bubbling or violent reaction, just a slow cleansing. Weaker Phosph Acid would have less effect.
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Bryan Douglass
=VAF= 2020 dues paid
RV-10 N242BD
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05-31-2011, 09:52 PM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 999
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If you choose to use Alumiprep or similar etching solution, do not let it dry on the surface, rinse off with lots of water.
My prefered technique though would be to aggresively scuff with course paper then wipe plexi down with Naptha, skin down with MEK, lay first 2 layers of glass, let cure, install some pop rivets for good measure, then lay further layers of glass on top.
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Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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