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Guide to finding & buying low-toxicity building caulk or sealant products: this article describes non-toxic caulks & sealants used in buildings, aquariums, water cisterns or springs and similar applications. We answer a reader question about how to seal a leaky water container for a spring, and we list several low-toxicity caulk brands for which we include key properties (and in some cases warnings) from the caulk MSDS data.
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Question: what to use to patch a leaky springwater container
Reply: approaches to sealing a spring or other container intended to contain potable water
Silicone or acrylic compounds in caulks and sealants are key ingredients in forming their waterproof properties when cured.
Watch out: the Mother Earth Living website contributor Debra Lynn Dodd (author of Home Safe Home ) recommended three caulks as "non toxic" that I list below.
However a look at the product MSDS sheets is further informative so I include some excerpts, noting that the possible toxicity of caulks, sealants, and coatings may be quite different between when the product is opened and applied and when it has cured, as VOCs and other products diminish during the curing and drying process. Certainly in the various caulk & sealant MSDS data sheets it is apparent that the risks discussed focus on exposure to the product "out of the box" or container, that is, before it has been applied, cured, diluted, etc.
List of Non-Toxic or Low-toxicity Caulks & Sealants
Other Caulks or Sealants for Pools & Water-Containers
Frequently Asked Questions (FAQs) about non-toxic caulks & sealants
Questions & answers or comments about non toxic or low-toxicity caulks & sealants.
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Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.