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.
Colds are contagious from about a week before you get them until all of your symptoms are gone, which is sometimes as long as two weeks. You might develop a secondary infection like an earache that lasts longer than contagious symptoms.olds are contagious from about a week before you get them until all of your symptoms are gone, which is sometimes as long as two weeks. You might develop a secondary infection like an earache that lasts longer than contagious symptoms.