Making a custom aggressive rear diffuser from expanding foam, fiberglass and plexiglass. Foam Gun: Sanding Sponge: Sanding Discs: Paint Brush: Measuring Cup: Plexiglass: Fiberglass (150gsm+:) Fiberglass (30gsm): DIY Front Bumper Spoiler: DIY Plexiglass Underglow: Instagram: Gaming Channel: Patreon: Shop: #diy #doityourself #howto #fiberglass #tuning #infinitig35