Well you could go 4 ft long 1 ft wide that would give you 1.5 ft depth with a 4 by 7 ft liner

what type of seam tape works with this materal

We did not tape any seams but LDPE should be compatible with any tape designed for use with pond liners. I do a lot of work with plastics and the two pieces of advice I would offer are buy a good quality, highly rated tape and wipe down any seaming locations with a proper solvent before applying tape. I usually use a 70% or higher isopropyl alcohol to wipe down any plastics or resins that I am bonding. It will remove any oils and release agents from the plastics and I have never found any plastics that it harms.

Can you cut it to the size you want

Yes, you can cut the pond liner into any size and any shape you want.

What type or brand of seam sealer will work on this product?

Personally I bought a seam sealer from the Pond Guy. But how well any sealer works depends on whether you are gluing together two liners of similar construct. This pond liner is not very flexible and rather brittle, and shiny. It did not match the rubber type liner of my current pond. Therefore, this liner did not suit my needs. I ended up pulling up this replacement liner and purchasing a small amount of proper liner from the Pond Guy, and more sealer. Don't waste your money on this liner

Manufacturer	KLEWEE
Product Dimensions	213.36 x 121.92 x 0.01 cm; 980 g
Size	20 Mil - 4 x 7ft
Colour	Black
Style	Compact
Material	Low Density Polyethylene (LDPE)
Pattern	Solid
Shape	Rectangular
Installation method	Floating
Special Features	UV Resistant
Batteries included?	No
Batteries Required?	No
Item Weight	980 g

KLEWEE Pond Liner, 4 x 7ft 20 Mil Small Pond Liners, Black Heavy LDPE Duty Pond Liners for Outdoor Ponds, Waterfall, Stream, Fountains

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