This will give you the hot metal look on exhaust pipes, mufflers and other hot parts.

Use a combination of the three colors provided to represent different shades of hot metal. Simply brush them on your painted item.

The hottest areas are at the bends of the headers or exhaust pipes.

Scale Auto magazine (Feb 2017) used it in one of their builds.

They stated, "I used a Tamiya weathering kit to represent heat stains on exhaust components. This was my first attempt at producing this effect and I found the kit was easy to use".

The kit includes:

Three colors - Burnt Blue, Burnt Red, and Oil Stain. 

Double-Tipped tool is included for application.  Keep Q-Tips on hand, as they cover a smaller area.

If you're going to be handling the item after coloring, spray with a sealer.

Two application sponge brushes by Tamiya are available:

Fine Tip Brush
Medium Tip Brush

One 3-color kit, by Tamiya