I nade a mistake. The product I linked to is not a hazard to the marine environment. When I wrote that, I was looking at a MSDS for Childers Chil Seal CP-50A MV2, a slightly different product. I suspect that either one would do just fine for a canoe.
There is some confusion here.
Childers makes two products that seem similar:
CHILDERS CP-50A MV1, a/k/a CHIL-SEAL® CP-50A MV1 Coating
and
CHILDERS CP-50A HV2, a/k/a CHIL-SEAL® CP-50A HV2 Coating
I cannot find a Childers Chil seal CP-50A MV2
The link in the post above is for an MSDS that seems to be out of date.
Both CP-50A MV1 and CP-50A HV2 have similar warnings about uses in an aquatic environment. CP-50A HV2 seems somewhat more hazardous;
both direct safety measures while using/applying.
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For
CHILDERS CP-50A MV1, a/k/a CHIL-SEAL® CP-50A MV1 Coating, there is a “Safety Data Sheet” revised 05-22-2117, superseding one dated 04-18-2117, that provides:
GHS Signal Word: Warning
GHS Classification: Hazardous to the aquatic environment - Acute Category 1; Hazardous to the aquatic environment - Chronic Category 2
GHS Hazard Phrases: Very toxic to aquatic life.; Toxic to aquatic life with long lasting effects.
GHS Precautions:
Safety Precautions: Avoid release to the environment.
First Aid Measures: Collect spillage.
Disposal: Dispose of contents/container in accordance with local/regional/national/international regulation for hazardous wastes.
see:
http://fosterproducts.com/wp-content/uploads/2017/01/CP-50A-MV1-SDS-0517.pdf
For this product there is also a “Material Safety Data Sheet” for this same product that was revisesd 8-12-2014, superseding one dated 1/05-2012. It has no warning about hazard to an acquatic environment, though it suggests protective gear for eyes, breathing and skin
. Note the earlier dates. see:
https://cdn.shopify.com/s/files/1/0...a-mv1-chil-seal-coating-and-adhesive-msds.pdf
A description of the product can be found at:
http://www.lcinsulations.com/childers cp-50a.pdf
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There is an apparently similar product, CHILDERS CP-50A HV2, a/k/a CHIL-SEAL® CP-50A HV2 Coating, that has a "Safety Data Sheet," dated 06-01-2017, superseding one dated 03-08-2016, with more significant warnings:
GHS Signal Word: Warning
GHS Classification: Hazardous to the aquatic environment - Acute Category 1; Carcinogenicity Category 2; Hazardous to the aquatic environment - Chronic Category 2
GHS Hazard Phrases: Suspected of causing cancer.; Very toxic to aquatic life.; Toxic to aquatic life with long lasting effects.
GHS Precautions:
Safety Precautions: Obtain special instructions before use. Do not handle until all safety precautions have been read and understood. Avoid release to the environment. Wear protective gloves/protective clothing/eye protection/face protection.
First Aid Measures: IF exposed or concerned: Get medical advice/attention. Collect spillage.
Storage: Store locked up.
Disposal: Dispose of contents/container in accordance with local/regional/national/ international regulation for hazardous wastes.
I have not found an MSDS sheet, so entitled, for this product..
For a product description, see:
http://fosterproducts.com/product/cp-50a-hv2/ and click on “PDS."
If you are thinking of using one of these products, please read the Safety Data Sheet for each in its entirety -- the C&Ps above quote only a small part of the sheets.