- Bold Hold Maxx is the latest and greatest silicone adhesive technology in the Bold Hold Product Line. This is our 1st true maximum hold silicone adhesive. This adhesive can yield holds in excess of 4 weeks with proper application by a certified professional. Its great for all types of hair systems and hair units. Bold Hold Maxx should be applied by certified professionals only.We advise non professionals not to use the product. This adhesive is lab tested and is skin safe for normal skin types. Not recommended for those with sensitive skin or skin disorders. This product is flammable and must be handled with extreme caution. Bold Hold Maxx should be stored in well ventilated cool environments.