![]() ![]() It's not suitable for use below the waterline. It's susceptible to UV damage and can often look like a bit of old chewing gum. It could last 20 years but it won't look great. It's great for serviceability and it's easy to remove and re-apply as well as being a lot less messy than traditional sealants. It can be easily painted.īutyl is a non-adhesive sealant normally found in the form of tape and has the characteristics of chewing gum, but can now be purchased as sealant. Polysulfide also makes a great electrical insulator and is resistant to vibration, shock, impact, and thermal changes. Polysulfides a synthetic rubber, forms a strong mechanical bond and has an excellent resistance to UV, fuel and oil as well as good general corrosion protection. It's notable that polyurethane is not compatible with acrylic perspex and other types plastic glazing. This is a testament to the strength of modern sealants. In the aviation industry on unpressurized aircrafts, windows are sometimes attached using adhesive sealant only. They are UV resistant and can be used below the waterline. Polyurethane sealants create an extremely strong mechanical bond when used on the correct surface. They will bond better but aren't as strong as polyurethane. For example the strength of polyurethane with the UV heat resistance of silicone. The idea being that each type of sealant has it's pros and cons so they just pick the pros from the best types. Hybrids are combinations of the best elements of existent sealers. Its downfall is that it makes for a weak adhesive and for this reason sometimes is unpractical for use below the water line. Its UV resistant, heat resistant, a great insulator and is ideal for creating gaskets. You can imagine why its been a favourite in boat maintenance for some time. It is said that silicone is an inert synthetic polymer compound and is technically part of the rubber family.
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