can this item be used to apply patches to a pvc inflatable boat?

Yes, as long as the pvc is a pretty thick mil. I actually used it to patch a LARGE split in our in-ground vinyl pool liner and it held up very well.

would this work to glue a seam on an outside cover made of 600 denier polyester ripstop fabric?

Hello! Sorry to say that HH-66 does not work with polyester fabrics.

can hh-66 vinyl cement be used under wet conditions??

Description says: "You can apply our clear vinyl adhesive in temperatures ranging from -30 to 150 degrees Fahrenheit, as well as underwater"

can i use this to close a leaking bottom of a home planter?

It 100% depends on what the planter is made of. If it is vinyl then you are all set. Planters are made from many different materials from woven to ceramic.

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🛠️ Stick with the best—HH-66 Vinyl Cement, where strength meets versatility!

SMOOTH APPLICATION - Brush or roll on effortlessly for a flawless, professional finish every time.
UNMATCHED VERSATILITY - Seals, patches, and bonds over a dozen materials including vinyl, metal, fabric, and wood.
ALL WEATHER BONDING POWER - Reliable adhesion from chilly 35°F to warm 95°F—even underwater!
DURABILITY MEETS FLEXIBILITY - Strong yet flexible hold that withstands wear, tear, and outdoor elements.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA since 1949, setting the gold standard in vinyl adhesives.

HH-66 Vinyl Cement is a premium American-made vinyl adhesive designed for professional-grade repairs and manufacturing. It bonds reliably across a wide temperature range (35-95°F) and even underwater, offering unmatched flexibility and strength. Ideal for repairing and sealing vinyl materials, tarps, pool liners, inflatables, and more, it applies smoothly with a brush or roller and adheres to multiple substrates including metals, fabrics, and plastics. Trusted since 1949, it’s the go-to solution for durable, long-lasting vinyl repairs.