Hobby Lobby sells a backing for latch hook rugs that is painted on. It dries white and can be washed within 2 weeks of application. Not sure about putting it in the dryer. I use it on the bottom of felted slippers and it works great. I jar (maybe a pint?) goes a long ways. I think I've done 5 pairs of slippers with it and I have quite a bit left yet. It costs about $9.99 a jar.