The active ingredient in naval jelly is phosphoric acid, a powerful chemical that converts rust directly to a water soluble phosphate compound called iron phosphate. That’s the basic method for applying naval jelly although I modified the approach slightly to deal with my rust stain. You brush it on, let it sit for 5-10 minutes, and then remove with fresh water. Yes, that pink goop that smells somewhat like rotten eggs. For this, I opted for good old-fashioned naval jelly. Phase 2 of the rust removal operation was to take care of the rust stain. This allows rusting to progress until it eats up all the solid iron. I read somewhere that this is because iron oxide (the rust molecule) is a larger molecule than iron so when iron/steel rusts, it “puffs” up, exposing more bare metal to damaging oxygen in the air. Finally, once rust gets a foothold, it becomes easier for it to continue growing. For another, you don’t want rust stains on the wood or affecting the wood finish. For one, rust can inhibit the sliding movement of stock on table surfaces – especially table saws and jointers. Quick note: It’s important to remove rust from power tools for a number reasons. The before photo shown below was taken at this stage. This removed the bulk of the rust build-up but a pronounced rust stain was still present. The first thing I did was to scrape off the rust “crust” with a wire brush and an old putty scraper, followed up with a drill-powered wire wheel brush. By the time I became aware of the situation, the damage was done and the outfeed table of the jointer had a nasty rust stain.Īfter attending to the open window and drying off the remaining condensation on the ducts, I launched into rust removal mode. This resulted in massive condensation on the HVAC ducts running through the woodshop ceiling (it’s a basement shop), eventually leading to water drips, one of which was right above the jointer. Unfortunately, it was the middle of the summer and the humidity was high. ( I generally close it within a few hours after most of the fumes have dissipated). It actually works fairly well at clearing the air but this time I was a bit forgetful and left the window open for an entire day. This involves opening one of the windows and turning on a fan that is positioned in front of the window to blow fume-laden air outside. One day in the woodshop… I was applying a finish to a newly constructed coffee table and I activated my fume control system.
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