one of my steam radiators has a leak on the bottom, away from the valve (has been checked, my husband has changed out the valve). can I use a spray sealant to seal this leak? (like FlexSeal)
From reading on the Internet, FlexSeal looks like a scam ($59.70 for shipping, signs you up for $29/month "membership" without asking). It looks like it's similar to automotive rubber undercoating, which you can buy locally for ~$5 per can.
I found a small hole in our steam radiator when we were refinishing it. I ended up using Loctite Steel Stick to fill it in. It has lasted a full season and I believe that it will last for the life of the radiator.
From the website:
Metal Magic Steel Stick(TM), Steel Filled, in Stick Form, 4 oz. Stick, Stick, Gray, 10 min. Functional Cure, Shear Strength 2500 psi, Temp. Range Up to 250 Degrees F, Work Life 3 min., Seals Pipes, Gas Tanks, Water Tanks and Vessels, Includes 4-oz. Stick