If you heat it, it will weaken it and will need to be replaced. Also, trade in your WD40 for some PB Blaster. I haven't found a bolt it won't free yet! You may have to use air to break it loose. Just know that there is a chance of wringing the bolt head off using air if the bolt is corroded badly. LOTS of PB Blaster! I bought a gallon container that came with a refillable metal spray bottle. It's REALLY happy stuff!