The PPG 410-48248X4L (4L) is a Deltron 2K Epoxy Urethane Primer designed for automotive refinishing, particularly for providing corrosion protection and superior adhesion on bare metal surfaces. It is commonly used in, but not limited to, the Australian automotive market. 
Key Features and Specifications
Type: 2-component (2K) Epoxy Urethane Primer.
Product Code: 410-48248 / 410-48248X4L (4 Litre container).
Substrates: Suitable for bare steel, aluminium, galvanized steel, and fibreglass (GRP).
Purpose: High-performance primer to protect against corrosion, often used under polyester fillers or 2K primers.
Mix Ratio: Typically used with a 4:1:1 ratio (4 parts primer, 1 part hardener, 1 part thinner).
Thinners: Uses Deltron thinners such as D870, D807, D872, or D873. 
Preparation and Application
Substrate Prep: Must be thoroughly cleaned and degreased (e.g., with Prepsol) and sanded (P240-320 dry).
Application: Can be applied over properly prepared steel, aluminium, or fiberglass.
Compatibility: Compatible with body fillers applied over the fully cured and sanded surface.