Marked all parts so I know where they go later, and then disassembled. I then spent ages deburring just the rear spar doubler. Refer picture below for the various tools I used to get a nice smooth finish on all edges and holes. I also used the scotchbrite wheel on the "outside" edges.
I thought I'd leave deburring the other parts for the weekend, and instead spent the rest of tonight experimenting with alodine. The second picture shows my four-bath "production line" ... deoxidiser--rinse--alodine--rinse. Prior to the baths I also gave my test part a good wipe over with isopropyl alcohol to get rid of all dirt and oils.
Even though I'm pretty sure I haven't got the deoxidiser concentration right (5 minutes and no bubbles forming), the end result on my scrap piece of aluminium angle is still pretty nice. I left it in the alodine for just under 3 minutes.
I mixed the Alodine 1200S granules as per the information sheet: 7.6grams per litre of water.
Think I'll give AED Technologies a call tomorrow and ask for their advice regarding deoxidiser concentration. I diluted to 10%, but it didn't seem to do anything.
UPDATE: Chris at AED Technologies advised that my deoxidiser concentration is correct. There's good reason I'm not seeing any bubbles, and that's because I'm not meant to. Acid-etch products (eg; Alumiprep 33) are the ones that etch the surface, and produce bubbles.
