Useful for repairing corrugated iron roofs and guttering. Bitumen impregnated repair patches recommended for on river bank coracle repair by holding patch over a lit candle and melting the bitumen before placing over the hole in your coracle. Personally I wear rubber gloves. Heat the patch both sides with a paint removal heat gun then apply patch. I spent 10 hours once totally rebuilding the rim (gunwale) of a Teifi Coracle using these patches. Painting over the whole with bitumen paint is also a good idea after the patch is applied. https://youtu.be/YPSOUiKld2c Copy and paste the you tube link to find out how easy it is to use.