Awlgrip is not like regular paint. It stratifies as it cures. The resin tends to rise to the suface of the paint as it dries, giving the paint a thin skin, while the pigment part sinks down. This skin is what is shiny. It protects the pigmentation, which is why the paint lasts 10 years if well cared for.
I'm not sure about Alexseal. I expect you should visit the web site and see what the vendor says.
The long and short of Awlgrip is that it should never be machine buffed, and should never be buffed at all if it still looks good, cause it is way too easy to screw it up. That skin is very thin and you can go through it. The Awlgrip web site
says clean it with Awlwash and protect it using Awlcare.
There's a ton of help and advice available here on Sailnet with regard awlgrip and you should read it, but the best bet is trust what the manufacturer and knowledgeable distributors say. Use the link above to see what the manufacturer says; use this link
to see an insteresting compare/contrast by Jamestown distributors. To query google for information from a specific site like Sailnet, pattern your query like the following search for Awlgrip buffing (but without the quotes):
"site:sailnet.com Awlgrip buffing"
Hope this helps!