A system and method for providing custom colored sealant are generally provided with a dispensing container, containing a quantity of sealant base solution. A bottom wall of the dispensing container is positioned to limit any headspace within the interior of the dispensing container until the contents are ready to be mixed. The bottom wall is moved prior to adding a coloring agent to the dispensing container, which is mixed with the sealant base by agitating the dispensing container, until a desired color is attained. A sealant thickener may then be added and mixed by similar agitation of the dispensing container. A rod may be provided to engage and move the bottom wall. A pull string may also be provided to move the bottom wall. A nozzle is then coupled with the dispensing container and the custom-colored sealant is ready to be dispensed.