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DennisM · 10-06-2010, 05:09

As you can see in the photo, I have a rust patch on the forward-most underside of my engine. The marine surveyor I used last year said to treat it with Boeshield T-9.

Two questions:

1. Should I pre-treat the surface using a wire brush and sandpaper, or is there a better/preferable method?

2. Is there something better to treat it with than what the surveyor recommended?

(Please don't tell me it's time to remove the engine and use it as an auxiliary anchor.)

Thanks as always,
- D

donradcliffe · 10-06-2010, 05:41

Forget what the surveyor said. The boeshield will just get it greasy and look terrible. Use a wire brush to remove all the rust you can, then brush on Oshpo or other phosphoric acid based rust converter. Then buy a rattle can of the engine paint, mask what's not engine, and spray the spot. It will look near new for a while, but try to keep the salt water off the engine, and rinse it off when you can't..

DennisM · 10-06-2010, 05:46

Oshpo, eh? Thanks, Don. Lemme go look that up.

Found it: Ospho... I'll check out the local hardware store for it.

Strygaldwir · 10-06-2010, 05:55

Definately wire brush. Phosporic acid (Ospho) to help neutralize the rust then POR 15 is an excellent way of dealing with rust and assuring it will not come back or succumb to the principle causes of the rust in the first place. I used this on several auto restoration projects and it stood the test of time (Well, 20 or so years in anycase). The POR 15 is GREAT stuff!

DennisM · 10-06-2010, 06:00

Thanks, Strygaldwir (wish I could pronounce that... is it Welsh?) :-)

I looked up POR 15, and it DOES look like great stuff.

Jetexas · 10-06-2010, 06:01

POR 15 works great. The POR actually means Paint Over Rust.

AnchorageGuy · 10-06-2010, 06:06

I too highly recommend POR. If you plan to paint over it, I suggest you let it dry until still tacky but not wet, then paint over it before it completely dries. Once dry, it is more difficult to prep and get the paint to stick. Also, do not apply heavily over bolts, since the coating is thick and a wrench will not fit the bolt without chipping off the POR.

DennisM · 10-06-2010, 06:12

Hmmm.... thanks! I see that Defender doesn't carry POR. Is it available at a hardware store or only in marine stores?

AnchorageGuy · 10-06-2010, 06:14

We bought ours directly from POR.

DennisM · 10-06-2010, 06:14

k thx I just placed an order for a pint of the silver.

Strygaldwir · 10-06-2010, 06:15

Okay, Keith might be easier than Stri-gal-dwire. Have to start signing my post again!

Not Welsh, I don't think. Roger Zelazny, my favorite author!

Keith

leslie · 10-06-2010, 06:26

From the pic it looks like a yanmar 2or 3gm motor. The amount of rust is nothing! Mine was worse. Wire brush + rust converter will work fine. Paint with a high quality 2k paint. In future I suggest keep engine parts covered with spray oil (once a week) but keep it off your belts.