Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Are these fibers used to prevent cracking of portland cement only after the initial pour or permanently? I want to strengthen hypertufa permanently.
Document: I bought this product to reinforce larger hypertufa planters I want to make. As i understand, if you throw this into the mix, you can safely count on leaving your hypertufa planters outdoors all winter and they won't crack.Only time will tell if this is true. I've used them already in a few planters and will see what happens come spring.Keep in mind these are very lightweight fibers. They'll easily blow away in a small breeze!
I have used this to mix with my hypertufa mixture in making planters and small garden sculptures.The sculptures have held up incredibly well and I believe it is probably due to adding this to the mixture forstrengthening the bond.
These nylon concrete fibers worked really great on some concrete work I did lately. They made the concrete much stronger.
Exactly what I ordered, and exactly what I needed. It helps to spray the fibers with a Waterhouse before mixing in the concrete to separate them. Goes a long way, 1 lb does a whole yard, or 70 50lb bags.
it just wasn't quite what i needed. i received it quick and it will work, but its hard to divide it
great for small concrete projects-can't wait to start my projects-goes with the books on small garden concrete projects for the garden
Works well to add strength to vinyl concrete when molding small parts. Mix into the dry concrete before adding water.
Answer: no