For ACP (Aluminum Composite Panel) sheets, a high-quality, neutral-curing silicone sealant is typically used. This type of sealant adheres well to both aluminum and the panel’s polyethylene core, remains flexible to accommodate movement, and resists UV light, moisture, and weathering. It’s essential to select a sealant compatible with ACP to prevent damage or discoloration and ensure a long-lasting, weather-tight seal.