While I'm reluctant to re-enter
.. the fray that seems to have developed over this issue, I would say that the two products I mentioned (and bought) both seem to have the same properties and seem to have been sold for about the same purposes, that is, permanent below the waterline repairs. While I agree that being able to compare the formulations of both products would be the ideal, neither productlisted their formulas on the packaging, as I recall. But as I stated in the original post, I tried some of the Home Depot product at home and, without subjecting it to scientific testing, I doubt most boaters would be able to tell the difference between the two products once they cured.FWIW, I plan to send this generic kind of issue on to "Practical Sailor" and see if they have any interest in comparing and contrasting what you can buy at the local hardware story and what you buy as "marine grade" in the boat stores.
.. the fray that seems to have developed over this issue, I would say that the two products I mentioned (and bought) both seem to have the same properties and seem to have been sold for about the same purposes, that is, permanent below the waterline repairs. While I agree that being able to compare the formulations of both products would be the ideal, neither productlisted their formulas on the packaging, as I recall. But as I stated in the original post, I tried some of the Home Depot product at home and, without subjecting it to scientific testing, I doubt most boaters would be able to tell the difference between the two products once they cured.FWIW, I plan to send this generic kind of issue on to "Practical Sailor" and see if they have any interest in comparing and contrasting what you can buy at the local hardware story and what you buy as "marine grade" in the boat stores.