#tar behaviour

[tarfyi]

How Tar Sticks To Surfaces

Tar sticks to surfaces through wetting, mechanical grip, viscosity, and gradual setting. It bonds best to clean, dry, porous, or slightly rough surfaces. Tar is naturally adhesive because it is thick, oily, and able to wet many rough surfaces. When it touches wood, rope, stone, or old porous material, it can flow into tiny irregularities. Once it thickens and weathers, those irregularities help…

[tarfyi]

Is Tar Waterproof?

Tar is water-resistant and can help shed water, but it is not automatically a perfect waterproof membrane. Its performance depends on the type of tar, surface, thickness, weathering, and maintenance. Tar has a long reputation as a waterproofing material because many tars repel water and cling to surfaces. On wood, rope, canvas, roofs, and seams, a tarry coating can slow water entry and reduce…

[tarfyi]

How Tar Behaves In Cold Weather

In cold weather, tar usually becomes thicker, stiffer, slower to spread, slower to settle, and less able to flow into small surface cracks. Cold makes tar less mobile. A product that brushes easily on a warm day can become thick and reluctant in a cold workshop or shed. This happens because the heavy oily and resinous parts of the tar flow more slowly as temperature drops. Cold application can…