I could not find anything in the Certainteed warranty document that specifically addresses roof coatings, but the warrranty exclusion section does exclude:
"Damage caused by structural changes, alterations or additions, or by the installation of equipment
(such as, but not limited to, aerials, signs or air-conditioning equipment) to the building after the
original shingles have been applied."
However, a Certainteed representative told me that they will not honor their warranty if the shingles have been coated with a chemical. Also, the warranty document contains a lot of vague exclusions that the company could use to deny a warranty claim.
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