... ;neutral cure; 2) weatherproof; 3) excellent extrudability and thixotropy. YA-369 Engineering Neutral Silicone Weatherproof Sealant is single-component, dealcoholized neutral ... )superb weatherproof,aging-resistant,ultraviolet-resistant,ozone-resistant ability. YA-369 Engineering Neutral Silicone Weatherproof Sealant