Screen frame corrosion

[russ]

What would be the suggested way to repair then paint the frame around the screen on a cruiser boat.
It has some paint lifting and bubbling on what I assume is aluminium. Without having to remove the glass and cleaning and prepping the surface what primer and paint should be applied?

 

[pcatterall]

This suggestion is one to 'improve things a lot rather than to make good as new' There will be experts along to tell us how to do it properly!!
If the 'lifts and bubbles' are accessible without removing the glass then you may be able to remove them with a sharpened tool and just sand the affected areas ( plus a light sand of the unaffected paint) then coat exposed metal with an aluminium 'etching primer' then overcoat the whole frame with top coat.
It may not look perfect but should keep further corrosion out for a while. You may have to do a more thorough job in the future!

 

[Stemar]

I used a silver Hammerite smooth paint for my frames. It worked OK*, but preparation is key and you'll never get as long lasting a result without dismantling the window. PCatterall's suggestion will work fine as an interim solution, but expect to repeat every couple of years.

*Hammerite used to be brilliant, but is no longer. I'd look at the Rustins offering from Toolstation as it's about half the price of Hammerite

 

[ghostlymoron]

Hammerite special metal primer is well thought of for this kind of thing.

 

[VicS]

I'd suggest Hammerite "Direct to Galvanised paint" which is suitable for " non-rusting metal", including aluminium, without priming.

https://www.hammerite.co.uk/product/direct-to-galvanised-metal-paint/

I am not normally a fan of Hammerite so perhaps Rustins "Quick Dry Metal Paint" , which is also suitable for use on aluminium, would be a better choice if a satin finish is acceptable

https://www.rustins.ltd/rustins/our-products/speciality-paints/quick-dry-metal-paint-black ( also available in white and other colours)

 

[Tradewinds]

IMO this product is very good.

http://metall-polish.de/shop/metaflux-aluminium-spray-abriebfest-400ml-p-4274.html

I've bought from this supplier (Franz Spiller) - prompt service.

 

[russ]

I would like to give the Hammerite Galvanised paint a go but do they do it in a spray can so to achieve a better finish?

 

[Seajet]

Do what you can to smooth out and repair the bumps, then apply Dulux Metalshield - I know Dulux sounds a joke but this is fantastic stuf, I use it on my steel keel and it's the only thing I've ever tried ( tried all steel and rust treatments, paints, epoxy etc ) which looks as good at end of season.

I also used it on the alloy tracks for my rubbing strakes.

One part but needs the special Metalshield primer - about £23 for each 750ml tin, from Brewers. Comes as white only as far as I know ( used to be silver so that may be available ) but can be overpainted; it doesn't like going on top of antifoul but ok with paint on top if white doesn't suit your frames.

 

[cpedw]

I had a similar problem, discussed here http://www.ybw.com/forums/showthread.php?464764-Kurust-Jenolite-equivalent-for-Aluminium.

I found that POR 15 has worked well for 2 years. There is a "starter pack" https://www.frost.co.uk/blk-por15-starter-kit/ that is good for small areas and a lot cheaper than other ways of getting all the different materials.

Derek