Chainsaw Repair

For these clamshell style cranks, anything to know about resealing it? Should I be using something like Yama bond?

I also ground some of the fins down a tad bit (just to round them out aesthetically) and so now there is exposed fresh aluminum. Is there something (and should I) to cover this with to prevent corrosion. I know some people paint or powder coat the heads. I would prefer to avoid any process too involved or costly. Really if I could just throw some bluing agent, or oil or seal, etc. on real quick that would be ideal.