Took the liner out and let it flatten out for a few weeks 40 mil heavy duty pan liner. We installed a floor deep sink since lifting heavy buckets and critters was getting difficult. Since we did not need the entire 6x10 liner I used some for quick roofing on some nesting boxes in the trees since my chickens are free range then used the rest to line the floor in one of our coops works great I pull it out and wash it down let it air dry and back in the coop again.I also think that its well worth just buying some for other things around the farm.
Pros: Durable, Easy to Clean, Easy to Install, Easy to Use, Good Size & Weight, Sturdy
If you're going to attempt to build your own shower, you have got to have a good liner. This is one of the most important parts of keeping the shower from leaking. This is a good liner. However, if you're going to build a shower that is closer to three feet wide, you can buy the same product cut to length in the store and you won't have to worry about creases.
But if you do have to worry about creases because the product was folded when it was shipped, hang it in front of a heat source for several hours (maybe a wood stove or a heat pump if you have one). The heat should help to eliminate the creases.
At any rate, if you install this correctly, your shower won't leak.