Rot Doctor

[Miscellaneous Q&A Index]

Subject: T-111

Date: Tuesday, March 31, 2020

Does CPES* work on T-111 siding? I am looking at around a window sill.



As long as the siding is dry, and well soaked with the penetrating epoxy, you will get excellent results.

Please note that while we have sold CPES in the past, we are now selling S-1 Sealer. Which provides comparable results to CPES*. If you have some CPES* on hand, use that. Otherwise, we can sell you the S-1 Sealer.


* This product is unavailable, we are selling comparable products that will perform these same tasks. Feel free to contact us if you need assistance with which products to use.

[Miscellaneous Q&A Index]

Have questions?

Contact us by phone 206-364-2155 or e-mail (send us your pictures) at and we will gladly answer questions about our products or how to apply them. With 20+ years of experience and many more in the boating and construction industries, not much surprises us. We are here to help our customers solve their issues. Let us help you to not have any surprises in your repair project.

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Tech support is available over weekends and holidays 8:30 AM to 5:30 PM Pacific Time.

The Rot Doctor, Inc.
P.O. Box 30612, Seattle, WA 98113
Voice: 206.364.2155    Fax: 206.364.4744    E-mail:
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