Hey Boris...
I run a yacht maintenance business and a charter business "Mariner
Sailing Charters"in Marina del Rey, California
This is how it is BEST done!
1. Remove all grease with laquer thinner and a rag.
2. Scrape off all loose and flakey rust, using old slot screwdivers
(for tight places) old chissel, toothbrush sized metal
wirebrushes(available at any ship's chandlery)
3. Treat the rust!!!! Use phosphoric acid. "Ospho" is one brand and
"West Marine" has one too. Chemically change the iron oxides(rust) to
iron phosphates. (Inert)! Just spay it on and wipe up the excess the
next day(it takes overnight)
4.Wipe up the excess Ospho with a rag and paint! Any paint that you
like the color of! It does not have to be spray paint either but you
better know how to handle a brush!

High temp paint is a waste of money. Only the exhaust pipe gets that
hot and it is under a fiberglass wrap, protected.....The rest of the
engine only gets around the temp of the water and oil...about 170
degrees max! I think Yanmar paint is about 26 dollars U.S. a can what a
rippoff....buy it for an exact color match only for it is not "High
Temp"...and by the way....try spraying "high temp" on your cars
muffler(really hot) and watch it burn off.....raw exhaust temps are
about 2500 degrees...

Captain Mack
www.gosailnow.com