Can a simple crayon really loosen rusted bolts when heat alone fails?

CLAIM — Old-timers' advice to use Crayola crayons melted onto heated rusted bolts works effectively to loosen them, as demonstrated 14 times on a saltwater-damaged excavator's hydraulic track motor where traditional heating alone failed.[1]

VERDICT — PARTIALLY TRUE.

EVIDENCE — The YouTube video from channel "Dirt, Grain & Steel" (uploaded March 20, 2026; 2.7M+ views) shows the creator heating rusted bolts on a 450 LC excavator, melting Crayola crayon wax into the threads (attributing success to capillary action), and removing them easily after 14 uses, vs. failure with heat alone 4 times.[1] Comments from mechanics (e.g., mining/shipyard workers) confirm using crayons/beeswax for decades.[1] Multiple sources describe the hack: wax seeps into threads as a lubricant barrier when heated, outperforming penetrating oils in some cases (e.g., MotorBiscuit, May 2025).[2][3] However, skeptics argue heat expansion alone loosens bolts, with wax incidental (e.g., Project Farm-style tests, Reddit discussions).[4][5] No definitive scientific debunk; anecdotal/practical support widespread since at least 2012.[6]

SOURCE CHECK — YouTube channel "Dirt, Grain & Steel" (@dirtgrainsteel): 171K subscribers, 1.7K videos on heavy equipment; creator Brandon shares practical demos; high engagement (111K+ likes on video); no description on video; corroborated by mechanics in comments.[1][7]

CREDIBILITY — 8 (practical demonstration and widespread mechanic endorsement, but causation debated vs. heat alone).

CONFIDENCE — 9 (direct video access, transcript, corroborating sources across platforms).

BIAS — CENTER (technical DIY/heavy equipment content, no political slant found).