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Caulk (also known as caulking and calking) [1] is a material used to seal joints or seams against leakage in various structures and piping. The oldest form of caulk consisted of fibrous materials driven into the wedge-shaped seams between boards on wooden boats or ships. Cast iron sewerage pipes were formerly caulked in a similar way.
The use of a blowlamp to kill dry rot by applying heat to the surface of affected areas was popular at one time. Obviously, this led to the risk of fire. Experiments showed that a surface temperature of about 100 °C (212 °F) would have to be maintained for up to five hours in order to produce a temperature that would be lethal to fungus ...
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A caulking sealant has three basic functions: It fills a gap between two or more substrates; it forms a barrier due to the physical properties of the sealant itself and by adhesion to the substrate; and it maintains sealing properties for the expected lifetime, service conditions, and environments.
Clean non-porous surfaces, like bathroom tile and ceramic floors, with mold-killing products, like bleach. Clean porous surfaces, like wood, with bleach alternatives such as a hydrogen peroxide ...
A silicone mold generally requires little or no mold-release or surface preparation, as most materials do not adhere to silicone. For experimental uses, ordinary one-part silicone can be used to make molds or to mold into shapes. If needed, common vegetable cooking oils or petroleum jelly can be used on mating surfaces as a mold-release agent. [22]
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