Polyurethane: This kind of caulk is ideal for outdoor use where quality is crucial. The caulk is a strong bond to all materials, including metal and masonry, and is able to withstand the force of movement, has an incredible bonding power, and is able to be painted.
Because of its bonding capabilities removal typically involves cutting or sanding the unwanted caulk. A paint thinner is required to remove it since it's a solvent-based substance. Therefore, it would be best to get help from experts for professional caulking and sealing services to avoid any kind of hassle.
It is a well-known caulk to fill in gaps inside floorboards since polyurethane is able to withstand the high-traffic strains of flooring. But for the majority of indoor uses, the use of caulk made of polyurethane is "over-kill".
Polyurethane caulk can be a difficult caulk to work with and is more difficult to put up. Because it's more difficult to handle, acrylic caulk can be used in a variety of ways that are suitable. Polyurethane can last for a period of 10 to 20 years.
Silicone: This product contains chemicals that cause the polymers "room temperature to vulcanize". Silicone caulk is essentially non-porous therefore it is ideal for creating watertight products.
It is commonly used in showers and sink applications as well as glasswork. It's rubbery, but it doesn't stick as well as other caulking substances. It was not until recently that they were not paintable. But, new hybrid silicone acrylics are now available with more flexibility and paintability.