If you live in an older home, then you may face the problem of sealing over asbestos pipe insulation. In the past, many homes were built using this material, before people realized that it was not safe. If you cannot yet afford to replace these pipes, then you need to use a liquid encapsulant to seal off the asbestos.
Step 1 - Make the Encapsulant
Put on your safety glasses, and put on the mask. This is necessary, because you will be exposed to asbestos, which is very nasty stuff, and can cause cancer if inhaled. The eye protection is to ensure that none of the material goes into the eyes, as this can be painful. For best results, use a safety suit. Open your liquid encapsulant, and stir it thoroughly to make sure that all the ingredients are mixed.
Step 2 - Apply the Encapsulant
Take the paintbrush, and apply the first layer of encapsulant over the asbestos pipe insulation. Cover it thoroughly, and then allow to dry. Return for a second coat once the first layer is completely dry.