Don't have a Traeger but I would not use truck bed liner.
Its kinda rubberized, there's to many chemicals that could give off harmful emissions.
Go with a High Temp paint, a brand name escapes me right now, Tremclad comes to mind.
Others will chime in with the correct brand.
Rustoleum....
Outside tools:
22" Weber kettle (2x)
Santa Maria grill attachment
2-burner Camp Chef Explorer propane stove
Temperature tools:
ThermaWorks Smoke
ThermaWorks ThermaPen Mk4
Inside tools:
36" Viking gas range
Anova sous vide
Lodge cast iron skillets, griddle, dutch ovens - several
Stupid expensive but very beautiful cast iron gifts for my wife - 4x
Other tools & accessories:
Buck Chef knife and serrated knife
Victorianox Fibrox Pro Chef knife - 3x
Cave Tools Metal Meat Claws
​​​​​​Meathead's book: The Science of Great Barbecue and Grilling
Yeah, I'm with smokin fool on this one - don't do the truck bed paint.
Rustoleum makes a high heat primer and several different high heat paint finish/colors. I can vouch that they work well for touching up old gas grills. Home Depot carries all of them.
I have done this with good results using the products mentioned above. Keep in mind that high temp paint needs heat to cure. Consequently, things like the hopper and legs that are not subjected to high heat need an ordinary exterior paint.
Good to know this. In the past I just used that black grill spray paint on both the firebox and cart of my old Weber gas grill, but I doubt I fired it up to cure it right off. Next time I do something like that I'll use regular paint on the cart portion.
Along with the others who already said so, do NOT use truck bed liner. It will likely melt at cooking temps. Use high heat grill paint, available at any hardware store. I used to use that to refresh my old Weber gas grill firebox, legs and cart with that stuff every few years, masking off the porcelain coated lid and side table on that grill.
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