Mod Podge, which is a waterbase Sealer, Glue and Finish in this 4oz ( 118ml ).
This product is very popular for Sealing the hair inside your Reborns head. I have done some testing with the use of sealing hair myself and found it very good.
I would not recommend it for Gluing Magnets or Sealing the Paint finish. Best use other products for those applications like the Satin/ Matte Varnish and E6000 Glue.