Professional-High grade 2oz CA glue kit High performance industrial grade adhesive. Black CA is used to bond parts, with focus on impact and shock absorbance qualities.. Some of the key advantages of using this adhesives are:Easy to useFormulated for LoudspeakersFast cure speed4 times stronger than regular CA Formulated for high vibration application, shock and impact resistantHumidity and heat resistantLab tested for optimal performanceOur Extra Thick Black Rubber Toughened Medium CA speaker repair glue is recommended for for spider to voice coil, spider to frame , cone to coil, surround to basket and some dust caps. Also used for hobby RC car tires, woodturning inlays, burl, and spalted wood. heavy duty bonding, and filling voids.It is important to keep in mind that black rubber toughened CA glues have an extended bonding time due to the added rubber compound. It can take as much as 24 hours to fully cure when larger volumes of the adhesive is applied. For these instances, use of accelerator is highly recommended.When well kept, our product can last a longer shelf life when stored in a cold environment. Just make sure to store the bottle under 40°F before and after use.Viscosity rating is 10,000 CPSPlease be advised that the higher the CPS of the glue is the shorter the shelf life is on the glue.If you don't plan on using the glue within 1-2 weeks after receiving it, we recommend that you to store in the refrigerator.