I made a post a few months ago titled 'no more metalizer sealer for me' or something to that effect.
I had just acheived a beautiful, bright, aluminum finish on an F-86 (MM's buffable aluminum) and when I sealed it with MM's sealer, it took away the brilliance and actually discolored it to a very slight "aged" look , almost amber in tone. Kinda like some of those clear canopies that you get once in a while that aren't quite "clear".
I would highly recommend spraying the same metalizer that you used on a scrap piece, and mask off and spray half of that sample with the MM sealer, then look at the difference.
If anyone knows of a better, truly "clear" finish coat (for metalizers) I would like to hear. Maybe my sealer was just too old, I don't know, but next time I will definitely do a test before I commit to my model.
As Pix said, there will be no harm to the OD green, and true, it will not be flat, but you could then just mask for painting the nose and glare shield and then spray a flat clear for those.
If you do use the MM Metalizer sealer, let me know what you think of the results.
stinger