I asked Rob specifically about that and he said it would work fine. I have been using it for a few months.
Looks like that will do. I found this in their catalogue:
Ox-Gard™ Anti-Oxidant Compound
The perfect safeguard for aluminum-to-aluminum, aluminum-to-copper
wire connections and aluminum conduit joints.
• Guards against oxidation.
• Improves conductivity; penetrates aluminum oxide to maintain
inter-strand and inter-conductor current paths.
• Produces a cooler connection.