Brief Description: Conversion coating on left substructure parts
I broke out the Sanchem materials for the first time today. I've chosen the Sanchem 6100 conversion coating system for all substructure parts rather than Alodine because of the simple disposal and handling requirements. Alodine has chromium in it, and presents a real problem for proper disposal. I also plan to coat the substructure and mating parts of the skins with Sanchem Sealer #2. To provide a more durable surface to externally exposed substructure (such as the rear spar), I bought AKZO primer from Spruce. It's a two part epoxy that is supposed to be very durable plus it's impervious to solvents, etc. Hope the grandkids are interested in a corrosion free airplane someday...So today, I started to apply the conversion coating to the HS substructure pieces. Quite a job to get an even looking coating. So far, the keys to good results seem to be as follows:1. Scrub the parts down really well with the Part C prep fluid. It's mildly acidic, so I used nitrile gloves. I chose 3M fine pads which take more elbow grease, but leave a better finish than the medium grit. 2. Let the Part C set a little while on the parts. I even brushed on a little extra for good acidic action.3. Rinse the parts well with distilled water. It seems that tap water leaves deposits that affect the conversion coating. Just pouring water over the parts is not enough. It's better to rub them a little with the gloved hand to get all Part C off. 4. Have a mixture of 1 part of Part A and 1 part of Part B ready in a small container. Immediately brush on with a disposable brush and let it do it's work. It seems that continuing to brush on additional part A/B whill the conversion process is working helps. Letting the parts set for even a few minutes after rinsing off the part C seems to result in a less consistant finish. Use compressed air to dry a part and put on the Part A/B mixture right away. 5. Let it set for a couple minutes and rinse with tap water. I still get a blothchy finish sometimes, but
