When should I apply acrylic sealer

[BuickFarmer]

Finished a pour of a 40X40 slab for a pole barn two weeks ago. Smooth trowel finish and saw cut joints. My question to the group is how soon reckon should I apply acrylic sealer. I have it "fenced" off with silt screen so dogs or humanoids for that matter can't easily track red clay in on it. I will not be using paint or sheet rock mud or anything else that I fear would stain it. I am concerned that if I seal it now it will get scratched or marked up and damaged by scaffolding or other construction activities. My main fear really is that no matter how careful I am that if I put it off, red Georgia clay will somehow find its way onto it and that stuff is tough to get out of concrete.
Will the acid wash clean red clay stains.
I will be applying two coats, should I maybe apply one coat now and the second after say the majority of the interior work is done?
Anybody with any experience with this?

 

[LegacyIndustrial]

Buick:
If you do one now and one later, you will have to wash, lightly scuff the floor, rinse and let dry. Even if you remove some of it in the process it will probably be better than letting that red-clay get in. It will stain the concrete pretty good.