Perfect technique can't make up for the wrong sealant. If you really want to stop that leak, start by getting the sealant right. You've been eyeing that bow cleat all winter. You can tell there's no sealant around the base anymore, and you've noticed the dirt trails on deck and below weeping from the bolts.
You're sure a leak through those bolt holes caused the annoying damp spot in the forepeak last summer. Time to stop procrastinating and re-bed that fitting.
Done right, it's one of the easiest, most satisfying, and most important jobs aboard, one that will not only keep your boat dry down below, but also prevent major structural damage. Done wrong, it can destroy deck coring and cost you a great deal of money and time to fix. Doing the job right starts with using the right sealant.
Picking the wrong sealant can cause a host of problems from early failure to not being able to free a fitting if necessary. Some sealants will never bond to plastic; others deteriorate when exposed to chemicals. Choose the wrong sealant and, at best, you'll be doing this job again next year. At worst, you'll have to destroy some of your deck to free a cleat.
Unfortunately, the manufacturers don't make it easy to figure out what sealant will work best for your particular project. Well-stocked marine-supply stores have four types of sealant on their shelves — polyurethane, polysulfide, polyether, and silicone — most of which say only "marine sealant" or maybe "adhesive sealant.
Rather than a gooey paste applied with a nozzle, butyl tape is a sticky solid pressed into position see sidebar.
The best-known modern marine sealant, 3Ma polyurethane, has a well-deserved reputation for unsurpassed strength and tenacity that makes it the go-to sealant. But, as you'll see below, for many applications, including bedding deck hardware, another product would be a wiser choice. A construction adhesive bonds two surfaces with a near-permanent bond; a sealant keeps water out. Strength is not the first requirement for a good sealant to bed deck hardware held in place by mechanical fasteners.
Understanding what really matters will help you to pick the best alternative. A good marine sealant for bedding deck fittings must be waterproof, of course, but it must also be flexible, UV resistant, and, ideally, chemical resistant fuel, bleach, and other solvents do find their way on deck occasionally.
It should not be so strong that the deck hardware can't be removed if necessary, or so tenacious that it leaves a residue that prevents other sealants from adhering. From an aesthetic perspective, it should resist dirt and not age in an unsightly way. The table below summarizes how the various adhesives line up against these criteria.Kurt Erickson has more than 20 years of experience writing for newspapers in Illinois, Wisconsin, Iowa, Missouri and Indiana.
Butyl Tapes vs Acrylic Tapes: Know the Difference
He is a graduate of Carroll College with a Bachelor of Science in communications. Erickson currently resides in Springfield, Ill. Butyl rubber caulk and urethane caulk are both used to seal cracks and joints from water damage primarily in outdoor settings. However, butyl caulk and urethane caulk are different products with different uses, application techniques and drying times. Butyl caulk is typically used to seal downspouts and gutters.
It also is often used on the foundation of houses and other buildings, especially below the soil surface where the foundation may come in contact with moisture.
Urethane caulk adheres to nearly all surfaces, including vinyl siding, aluminum, masonry and wood. It is best employed when sealing cracks in these materials. Butyl caulk never completely hardens, so it works well in areas that might be prone to slight movement, such as a rain gutter or roof flashing.
Urethane has a low shrink rate and good water resistance. Butyl caulk can be difficult to apply in a clean and neat manner.
It can take on the appearance of tar, but it can be painted over. Urethane is prized because it can seal cracks and also later be painted to match the area.
Urethane caulk takes longer to dry than some other types of caulk and sealant. Typically, it should not be painted over for at least two days. If using an oil-based paint, urethane should dry for at least seven days before painting.
Butyl can be messy. It often won't stay in a tight bead, meaning it spreads out over a surface. Urethane caulk sticks to almost everything, meaning it should be applied with care.Not all adhesives are created equal. Other times, it needs to be darn near irreversible. High-performance building contractors also need to consider adhesive tapes capable of withstanding temperature extremes and volatile moisture conditions; adhere to a wide variety of substrates; and tolerate the dust and dirt found on the surfaces of the building materials or the job site.
Is that acrylic or butyl? Silicon or rubber? Choosing the right adhesive polymer is often the difference between success and failure. That said, there are four basic types of adhesives used in tape all of which differ in characteristics as well as cost.
Rubber: Adhesives which are based on natural or synthetic rubbers and formulated with tackifying resins, oils, and anti-oxidants.
Sikaflex or 3M 5200
Rubber is often the most cost-effective adhesive and offers quick stick capability. Rubber adhesive is not recommended for high heat applications. And while butyl sticks better to more substrates, butyl is also more expensive. Solid acrylic adhesives can form the strongest adhesive bonds at a wide range of temperatures and even achieve adhesion to damp or wet substrates.
Solid acrylic adhesives are also VOC-free, and the absence of any solvents means little to no embrittlement of the tapes over time.
Both water- and solvent-based acrylics are similar in cost to butyl rubber tapes; however acrylic adhesives typically develop a stronger bond than the traditional Rubber adhesive and are able to take higher temperatures. Silicone: Formulated with Silicone polymers and the only adhesive that will bond well with silicone substrates. Silicone adhesives are relatively expensive and have a very low initial tack, but can withstand higher temperatures than both Rubber and Acrylic adhesive.
So, which is the best fit for your application? Well, for builders and professional contractors, it really comes down to butyl and acrylic. Butyl tape is an example of a synthetic rubber adhesive. All types of rubber adhesive are thermoplastic, so exposure to high heat will soften the adhesive and impact its effectiveness.
However, butyl adhesives are formulated to be less sensitive to temperature variations. They stay more flexible in cold weather and more stable in high temperatures than natural rubber adhesives. Acrylic tapes are either water- or solvent-based. They are created by crosslinking monomers to create polymers with specific properties.
The only real downside is the cost; these tapes cost a bit more than the rubber or asphaltic tapes. Builders often use acrylic tapes to completely seal a home, creating an airtight envelope.
As always, the adhesive compound is just one factor that should be taken into account when selecting the right tape for the right application. Still not sure which tape is right for your application? Contact us. We love a good tape challenge! To learn more about ECHOtape and how we help customers find the right tape for their job, you can read about us here.
So much,…. If only…. Facebook Twitter LinkedIn.Bedding is the process that seals water out of the hole in your deck by using a silicone or rubber sealant. Marine silicone, like our 3M Marine Mildew Resistant Siliconeis a readily available bedding and sealant compound.
It is clear in color, works on fiberglass, wood, metal rubber and vinyl surfaces and cures in 24 hours. Silicone is great for use as a galley and head sealant, gasket adhesive, or bedding compound for portholes, hatches, windows, and marine hardware. Silicone seals and waterproofs while remaining flexible and is especially great for Plexiglass or Lexan surfaces. Many sailors find silicone messy and difficult to clean off your boat.
To prevent this, the best way to clean up the silicone is to wet sand it off, rinsing your sandpaper frequently to prevent grinding the silicone deeper into the gelcoat. Silicone has a mediocre shelf life. Once a tube has been opened it will last for a year or two before drying out. Butyl Tape is a non-hardening, elastic rubber that is great for bedding applications on boats. It can be used to waterproofing holes made for bimini and dodger frame fittings, snaps, awning track installation, stanchions and much more.
Butyl tape is a soft, malleable material that can be easily trimmed, pressed and formed to create a water and airtight seal. Butyl tape is easily removed from hard surfaces without damaging the surface, even after years in the application and the same roll of butyl tape will last for years and years on the shelf.
Most importantly, Butyl tape can be broken down with mineral spirits, so it should not be used to bed fuel fills or vents as the fuel can damage the butyl and the seal. We recommend using butyl tape for bedding deck hardware due to its ease of use and cleanup, longevity both in an application and on the shelf and affordability. However, there are applications where marine silicone is preferable like bedding portholes, bedding on plastics, or for other areas where butyl is not recommended.
It releases and removes the as claimed, bought mine from the us online. Amazing stuff. SecretpursuitMay 19, Wish I'd known about debond back then. I'd always thought that marine parts glued in place with were subsequently renamed "leverites", as in, "leave her right there". Last edited by a moderator: May 20, SharphooksMay 20, Finished BusinessMay 21, Scuff the surface a bit? Yeah, if you scuff the surface then you increase the bonding area so that should help. A few years ago I was buying an outboard and had to remove it from the back of the guys boat.
He had applied tons of on the bracket to seal around the mounting bolts to the transom. After removing the bolts three men pulling up on the leg of the motor couldn't break the seal.Sealing Our Metal Roof With Metal Butyl Tape
The outboard bracket was aluminum and it was bonded to the fiberglass so it's a strong seal!Any content, information, or advice found on social media platforms and the wider Internet, including forums such as YBW, should NOT be acted upon unless checked against a reliable, authoritative source, and re-checked, particularly where personal health and liberty is at stake. It is your responsibility to provide references to bona fide sources.
Forums New posts Search forums. What's new New posts Latest activity. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. REMINDER Any content, information, or advice found on social media platforms and the wider Internet, including forums such as YBW, should NOT be acted upon unless checked against a reliable, authoritative source, and re-checked, particularly where personal health and liberty is at stake.
RumPunch Member. V Well-known member. CT1 here as well, lots of different jobs, don't buy clear any more due to same issue others have mentioned PabloPicasso Active member. Joined 12 Feb Messages 1, PabloPicasso said:. For deck fittings use butyl tape. It never goes off and is cheap, re-useable, waterproof, and flexible. Why would anyone use anything else?
Sneaky Pete Member. Used it for years now without any problems, and a very good price from Toolstation. Joined 4 May Messages Location Wirral.A primer on RV sealants and procedures that will keep your motorhome watertight and airtight.
No motorhome owner wants water to leak into the coach, a situation that can lead to rot, mold, and damage to the interior surfaces. Most leaks occur because a sealant has failed. If you already have a membership with us, sign in now to get full access! Toggle navigation familyRVing.
RV Sealants January 1, Self-adhesive rubber weather stripping is commonly used on slideouts. By Mark Quasius, F January No motorhome owner wants water to leak into the coach, a situation that can lead to rot, mold, and damage to the interior surfaces. As a motorhome is driven, it flexes and twists somewhat, and its joints and seams give a bit.
Sealants also help to prevent squeaks and rattles as joints flex; to stop air leakage; and to block exhaust gases and holding tank fumes from entering the coach.
Sealants do not last for the lifetime of the motorhome. They wear out, and proper inspection and maintenance are necessary to ensure that they continue to perform their assigned tasks. However, not all sealants are alike. Many sealants are packaged in tubes and are dispensed from a caulking gun or a small roll-up tube.
Such sealants cure upon exposure to air or contact with moisture vapor. As long as they remain in their sealed container and do not exceed their shelf life, they stay in their uncured state and ready for use. Sealants such as butyl tape or rope caulking are commonly found on rolls with a paper liner. Some sealants are dispensed from foam guns or disposable aerosol cans; they generally have excellent insulation properties and can be used to seal large gaps.
Rubber weather stripping is a sealant that prevents water intrusion as well as air leakage; such sealants often are self-adhesive and feature peel-off backing. A number of sealants in tape form are available as well. Many are useful for temporary repairs, although some tapes, such as EternaBond, can be virtually permanent.
Elastomeric sealants have elastic properties and can be natural, such as natural rubber, or synthetic, such as butyl rubber or neoprene. A sealant must have some flexibility to be effective; a hard, inflexible sealant will crack and shear when subjected to the stresses of normal travel.
A bit of flexibility allows a small amount of movement without breaking the seal.