南非采购需求：硅酮密封胶、粘合剂密封胶、聚氨酯密封胶、周边密封胶、防风雨中性硅酮密封胶、聚氨酯密封胶

I'm looking for solutions to effectively seal my roof and ensure it's well protected against leaks and weather damage. My goal is to find quality sealing materials that can provide durability and long-lasting performance. I would appreciate it if you could share details about the different types of roofing sealants and coatings you offer, including any relevant specifications and application methods. Additionally, I'd like to know about the availability of samples or product testing options to evaluate their performance before making a larger purchase. Please include information on pricing, bulk order discounts, and estimated lead times for delivery. Understanding these aspects will help me make an informed decision on which sealing product to choose for my roofing project. Thank you for your assistance!