Adding Heavy Weight to Plastic Models. Apply GRAVITY™ to your plastic models and experience the solid feel of die-cast. GRAVITY™ is an internal filler engineered to add weight to lightweight plastic models. Applied inside the model, it helps increase mass, improve balance, and enhance overall stability. Made with high-purity iron particles, it delivers substantial weight even in small quantities. Key Features: Easy and Effective Weight Increase: GRAVITY™ is an iron-based filler that is three times heavier than water, delivering concentrated weight in small spaces and enhancing model balance and stability. Smooth Paste with Adjustable Viscosity: GRAVITY™ has a smooth, spreadable texture that fills gaps and complex spaces. If it begins to dry during use, simply restore its flow with FLOW ENHANCER (sold separately). Magnet-Responsive Iron Particle Formula: Made with high-purity iron particles, GRAVITY™ responds to magnets and can be used for various magnetic customization applications. Safe Water-Based Formula for Indoor Use: GRAVITY™ is a low-volatility, water-based formula ideal for indoor modeling. Its low reactivity makes it safe for use on plastic, metal, and other common materials.