I've used Radweld quite a few times on different engines & only ever had good results.
This product has been around for years & the manufacturer would have gone out of business long ago if it caused major problems.
Have you been topping up with the correct coolant mixture or just water.
If water, make sure you restore the correct anti-freeze ratio, especially in this cold snap.
Keep checking the level & if still dropping look for the leak on a dry bit of hard standing or go for the dye test.
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