What is your project? Most of the planters, stepping stones and plaques don't require fibers, you are just adding more expense (if you have to buy fibers) and more work. Billie

CC,
I have an old book about concrete and cement; it talks about using goat hair as "fiber" additive.
I think it may be worth a try.
Dena

I think animal fibers being organic might break down with time as opposed to the polyester or fiber glass stengthining fibers. I put polyester fibers in just about everything I make. They help prevent cracking, and the cost is only pennies per hypertufa piece

But Fred, if your making a planter or stepping stone you really don't need fibers. It depends on the original poster's project.
Yes, they use to use animal hair in mortars, plasters and muds. My parents old house has horse hair in the plaster. Billie

I have no experience with animal fibers, so I'm sure you must be correct. I am willing to be educated, so tell me--If you don't put fibers in stepping stones or troughs, just what would put them in? Maybe I am using the wrong fiber since you comment on the cost and extra work. I buy bag of polyester fibers from a concrete supply company for $5.00, and that is enough for at least fifty troughs. Adding the fibers to a wheelbarrow of mix takes only a few minutes. Are there better fibers that I should be using? Your experience may may show that fibers are not always needed, but I have always used them without a cracking problem, so I'm reluctant to change.

2 cents worth.....
human hair doesn't break down, horse hair doesn't break down, I would certainly try the wool. Can't hurt....
I use fibers also, cheap, ez to grab a bit and toss in, so I'm with you, why not. It's just a little added Insurance.
Marcia

Have made many hypertufa containers with and without fibers. I really have not noticed much difference. By using fibers in large projects there may be some added strength, but small containers -- I am not sure of the benifit. Although the fibers are cheap - There is the extra step of buying a small torch and burning the fibers off when complete- unless you like hairy pots!

I do like to add different ingredients to my mix, so maybe the hair may make a unique look - so go for it and let us know how it turns out
{{gwi:67733}}

Without fibers

Mike

Thanks, everyone, I will try. Actually, i was planning on leaving some of the fibers hanging out of some of the projects to allow a thorough live coating by climbing plants when they're growing in them... or moss, which I love the look of. I may try some of the fibers washed, and some unwashed (with lanolin on them still). Why not - a good philosophy - i like it!