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You will need to remove the seal coat off the surface first and that is going to take some time. There are a number of products for that. Once you do you can polish the aluminum and re-coat it again. If you don't it will oxidize quickly and all that work will be for naught. This will take quite a few hours and some elbow grease. Not many willing to tackle this and do it right, but more power to you! If you need more on this please get back to me as all follow ups are included in our fee.
There are a number of paint strippers out there for this. And as far as the number of hours, that would be just a guess. I doubt you can do this in less than 40 hours and I suspect it wold take more to do it correctly. Hope that helps some here.
Just checking back to see if you were able to resolve this issue with the material I provided or do you still need some additional input from me here?