You must carefully adhere to the precautions as it concerns asbestos sampling. Ensure the asbestos is wetted with fine water and a little detergent. There are products made to seal damaged spots and fill holes. A little portion of material like pipe insulation may be closed by using a special material (like re-wettable glass fabric) to wrap around it. You may obtain these materials from retail outlets that deal on asbestos materials and other safety items.