good zinc primer

[colvic987]

i am looking for a good zinc primer in aerosol, i have seen some at halfords but seem only suitable for cosmetic cover, i have an old engine i need to prime before i repaint, and want to get a good base coat, which i hope will last for a few years.

i am having trouble in finding one suitable, as i might have to order from the internet, as the motorfactors i have been to don't sell any.

 

[DownWest]

Google "Zinga". Not a spray, but pretty good. Personally I would rather brush on a good coat if used as a primer. I haven't used it in marine stuff, but it has been mentioned here as a primer for cast iron keels, so an engine block would be in line with this.
A

My steel supplier has several brands of spray zinc, unfortunately I can't bring them to mind. Aimed at the touching up if a galvanised item is altered or welded.

 

[Ocean Safari]

Zinga comes in a spray as well, it is very good. I have seen it in one of the marine magazines - can't remember which one but too expensive. Check for supplier near you on Zinga site.

 

[vyv_cox]

I sprayed a Delta anchor with a cold galvanising aerosol spray. It was bought in France at a DIY shop, so can't suggest a name. Screwfix and Wickes sell similar stuff. I was quite impressed with it after it remained in good condition for a season of anchoring pretty much every day.

 

[gull1066]

Zinc

Don't use zinc primer, use an etch primer instead. If you get a good one then that will be all you need. Several on the Market and they have great adhesion quailties.

 

[MM5AHO]

The thing you need when choosing a zinc rich paint is zinc content.
An easy way to tell this is the weight of the can. If it feels really heavy for the size (relatively speaking) then it probably has a high zinc content.
Zinga mentioned above is a good zinc rich paint, Galvafroid is another.
Pure Zinc costs about $2000/tonne today, so if its cheap, then it probably doesn't have much zinc, and that's what your really buying, zinc. the paint it comes with does little or nothing to protect, in fact the paint actually detracts from the zinc's ability to give electrolytic protection, so you want little paint, lots of zinc. Just enough paint to get the zinc to stick there.

 

[vyv_cox]

Don't use zinc primer, use an etch primer instead. If you get a good one then that will be all you need. Several on the Market and they have great adhesion quailties.

Etch primers are good on non-ferrous metals, such as aluminium or galvanised steel. They contain some type of caustic that reacts with the metal surface. The OP wants to prime a cast iron engine block, on which an etch primer will have no useful effect.

 

[Gwylan]

vote for Zinga

i am looking for a good zinc primer in aerosol, i have seen some at halfords but seem only suitable for cosmetic cover, i have an old engine i need to prime before i repaint, and want to get a good base coat, which i hope will last for a few years.

i am having trouble in finding one suitable, as i might have to order from the internet, as the motorfactors i have been to don't sell any.

We used Zinga to revive our declining anchor chain - so far very pleased with the results. Not at all sure how suitable it is for your needs

 

[Bilgediver]

Don't use zinc primer, use an etch primer instead. If you get a good one then that will be all you need. Several on the Market and they have great adhesion quailties.

The grey primer in Halfords...Aerosols used to be etch primer and is OK for this

 

[Rigger Mortice]

Etch primers are good on non-ferrous metals, such as aluminium or galvanised steel. They contain some type of caustic that reacts with the metal surface. The OP wants to prime a cast iron engine block, on which an etch primer will have no useful effect.

+1 Agreed.