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Hugs, Jane.
I've used Mod Podge to harden needlefelting before, don't know if it's right lol, but it worked for me.....xxx
Hi Jane, there a a couple of different things I have used to harden needle felt. I am in the US so brands may be different. The paint company Delta Ceramcoat sells something called All-Purpose Sealer. It is used to prepare wood and other porous surfaces for painting, like a clear gesso. It makes the felt really good and hard. The other is Mod-Podge which I know we have discussed before it is a decoupage glue and sealer, more plasticy, leaves the felt firm but not super hard.
Either way I use a paint brush to dampen the felt before applying. That way whatever you use can soak into the felt. I always wet my brush and then pick up the material to dilute it down some. Around the area where the felt is not to be hardened I even dilute it more so it blends in. I apply a couple of coats. I sand lightly with an emery board to smooth.
Joanne
I wonder, would a fabric stiffener work? Just talking out loud. I use Aleen's Fabric Stiffener for hardening crochet vessels/bowls etc. and it's a permanant stiffener on yarn without making it feel like plastic but I have never tried it on needlefelting. Hm.
Another thing that makes needle felting more firm but still workable (it shrinks the fibers) is to paint using hot water with a drop of soap in it.