Spiral Wound gaskets can be fabricated of any metal which is available in thin strip and which can be welded; therefore they can be used against virtually any corrosive medium dependent upon the choice of the metal and filler.
Theoretically, it is no longer contagious when there is no more fluid leaking from the sore, and no new blisters are forming. However, I always assume that a cold sore is contagious until it is completely healed, and to the best of my knowledge I've never transmitted the virus to anyone else. Abreva is a very good remedy. If applied when you first feel the tingle you can actually prevent the cold sore from erupting into blisters.
Are cold sores contagious? Yes. Theyâre contagious (easily spread by physical contact) from the first tingle you feel on your lips until they are 100% healed. The virus is passed on by direct contact, not in the air. Cold sores are at their most contagious when the blisters burst, so you should be extra careful to avoid close contact with people until the sores are completely healed and all signs have disappeared.