harrytom 642 Posted May 4, 2016 Share Posted May 4, 2016 Have a yanmar that's showing signs of rust etc Want/need to paint in place(removing not a option) what's best?degrease first,wire brush rust areas Now what primer to use?? top coat Vht paint? Quote Link to post Share on other sites
wheels 543 Posted May 4, 2016 Share Posted May 4, 2016 Yep, you're onto it. Then I would prime using PA10, the red one, not the black. I have tried many different primers/undercoats over the years and am slowly coming back around to the old faithful PA10 as being probably the best performer. I wouldn't worry about VHT. Diesels just don't get hot enough. VHT is fine on exhaust manifolds etc, but the engine blocks don't need it. So go for a good top coat. Quote Link to post Share on other sites
waikiore 398 Posted May 4, 2016 Share Posted May 4, 2016 Yes Wheels is right re primer, just degrease carefully first, as an aside the old epiglass engine enamel was just the same mix as their Marinecoat ie single pot Alkyd enamel. Post cured nicely with the heat of the engine! Quote Link to post Share on other sites
harrytom 642 Posted May 5, 2016 Author Share Posted May 5, 2016 Thanks for the replies,really needs doing and I have put of long enough, Quote Link to post Share on other sites
Chewing Gum 17 Posted June 1, 2016 Share Posted June 1, 2016 On our Yanmar we used a waterbased primer which has phosphoric acid in it and called Blackguard. It is awesome. Then just get a can of spray paint colour matched at a car paint place and your engine will look like new. We did ours about 10 years ago and it still looks great. 1 Quote Link to post Share on other sites
harrytom 642 Posted June 5, 2016 Author Share Posted June 5, 2016 did mine last weekend and looks great,probably next time would remove but I am lazy Quote Link to post Share on other sites
wheels 543 Posted June 5, 2016 Share Posted June 5, 2016 On our Yanmar we used a waterbased primer which has phosphoric acid in it and called Blackguard. It is awesome. Yes it is, but it does not like heat too much. But you can get a water based primer also with Phosphoric Acid that can withstand 900degC. Also a great product. But I have found you really need to top coat it with something, because after awhile the primer surface chalks and rubs off. I will try and remember the name and post it here. Quote Link to post Share on other sites
piebuss 0 Posted August 22, 2016 Share Posted August 22, 2016 Is it normal to paint the exhaust? Mine looks a little rusty. Do you treat it with an anti rust paint, or just wire brush, clean and undercoat? Quote Link to post Share on other sites
erice 732 Posted August 22, 2016 Share Posted August 22, 2016 exhausts can be painted with vht paints wire brush and spray http://search.supercheapauto.co.nz/search?w=high+temp+paint Quote Link to post Share on other sites
harrytom 642 Posted August 28, 2016 Author Share Posted August 28, 2016 Is it normal to paint the exhaust? Mine looks a little rusty. Do you treat it with an anti rust paint, or just wire brush, clean and undercoat? give it a good tap to make sure its still solid,ours looked rusty but felt solid till 11.00pm one night we decided to motor and it decided to part company,amazing how much water goes through a engine in a short period,ended up disconnecting water intake and put hose straight in to bilge,basically recycling water Quote Link to post Share on other sites
piebuss 0 Posted August 29, 2016 Share Posted August 29, 2016 Assume you're talking about the exhaust elbow, otherwise where did all the water come from??? Our elbow is stainless, and in pretty good nic. The exhaust manifold is what I was referring to. It's just surface rust by the look of it, so I'm going to wire brush down and paint over it. It seems to be cooled by the engine coolant, so that should keep the temp down quite a bit. Anybody know where you can get the Lehman (or Lee's) red engine paint? Quote Link to post Share on other sites
harrytom 642 Posted August 29, 2016 Author Share Posted August 29, 2016 yep exhaust elbow with lagging,now no lagging and no rust, Quote Link to post Share on other sites
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