Oh god dont use that leak stop stuff. It crystalizes in there and makes a mess. I had an old car where some PO did that to stop a leak in the heater core. It gave way after I took ownership and there was this awful crystalized mess inside my heater valve, heater core, and the rest of the cooling system. So I had the pleasure of having everything hot tanked and cleaned.
If you have leaks around a hose, replace it. Sometimes new hoses will leak until you get everything seated properly. The expensive as hell t-bolt hose clamps from McMaster will help a lot and look great doing it. They are part number 8946K series clamps on page 216 of the catalog - available in all stainless. www.mcmaster.com