[ERA Chas]

El,
Per Barry R's instructions I used the Motorcraft gray diesel silicone the following way:
Make a sandwich of 2 gaskets and the windage tray. (Be sure to flatten tray and pan rail and check on a plate of glass for flatness)
Apply silicone with a credit card as squeegee to one gasket and attach to tray. Lay on glass with weight. I gave it about an hour but less will work. Attach second gasket to other side of tray the same way. Spread the silicone evenly but get a nice coverage so you can just barely see the gasket through it. Weight and wait again.
Now take this assembly, coat the gasket again, attach to pan, invert again on glass and weight the pan. I used a few studs as alignment 'tools' so all the holes line up as it dries.
When dry, coat the last gasket surface and attach the pan/tray assembly to the block trying not to smear the silicone. Having studs to locate the pan helps. Of course, the block surface should be hospital clean and dry. Use acetone or lacquer thinner.
Torque by feel as evenly as you can but don't 'kill' them. They'll take maybe a quarter tun again after you run it and cool it.
This is what worked for me.