How long should I wait to recoat smooth Hammerite with Clear Waxoyl?

[Submariner1]

Any one done this?
I did have mega problems, when I recoated my brake calipers sprayed with smooth hammerite, with acrylic clear coat ... bubbled up after a few hours. Told by Hammerite tech support to wait 3 days .. same effect :-(, then Re-did them and waited 7 days same prob. :-( :-(

Lesson learnt just used Hammerite on its own and 2 years later looks fine.

But this is for the underdeck of an Aluminium Lawnmower.
Some of the paint had come off and in places had some white dusty aluminium oxide.

I will need to cut the lawn soon, but don't want a repeat nightmare.

the problem according to Hammerite tech support with overcoating with acrylic was the clear coat sealed quickly but stopped the Hammerite exuding the solvent as it really dried!

I am hoping, that WaxOyl being petroleum based (thinned with white spirit) will not cause this horrible effect.

But I would rather ask someone, who has actually used Waxoyl on top of hammerite was it OK? And how long did you wait before spraying on Waxoyl?

 

[Submariner1]

 

[malcolm E53 AMG]

Is this a Honda rotary? I had one of those with the same problem and removed the oxidisation with a drill and wire brush attachment then primed and top coated with Hammerite didn’t feel the need to seal with anything. The underside of the cutting deck is a really hostile environment so will need periodic maintenance and repainting I get why an aluminium casing is used but it’s not the ideal solution

 

[Submariner1]

Is this a Honda rotary? I had one of those with the same problem and removed the oxidisation with a drill and wire brush attachment then primed and top coated with Hammerite didn’t feel the need to seal with anything. The underside of the cutting deck is a really hostile environment so will need periodic maintenance and repainting I get why an aluminium casing is used but it’s not the ideal solution

Thanks its a Kaaz, Honda sold the old professional designs and transferred the engineers when they moved to China. So you get the reallY heavy duty 68 Kgs and it comes with the latest Honda 5.5 OHV and blade brake.

luckily it was not really oxidised yet, more some missing paint , stone chipped. Here and tere a little bit of white oxidation - so didnt want to wire brush yet.
The Waxoyl is also to cover the mechanics/ struts wheel holders that are Galvanised.

 

[ajlsl600]

Was lucky mine steel. Had it metalized then silver hammerite no issues... With Ali if u can get it clean enough. Suggest etch prime leave a wek then hammerite.

 

[Submariner1]

Was lucky mine steel. Had it metalized then silver hammerite no issues... With Ali if u can get it clean enough. Suggest etch prime leave a wek then hammerite.

I have heard etch primer was the way to go, but I didn't have any, and there were only intermittent stone chips where the powder-coated paint had broken through. So I used barkeepers friend, which is Oxalic acid to really clean all the crap off and hopefully any oxidised alu where the stone chips were. Obviously scrubbed it 3 times with strong fairy liquid to remove all the Barkeeper !
IF it doesn't last well I will go the etched primer route.

 

[Rappey69]

You used to have to use "special metals primer" before putting hammerite on aluminium.
Galvanising and aluminium are very special cases when it comes to painting so need to use compatible products to avoid the ally oxidising under painted surfaces.
As for the waxoil, surely it should go straight on the bare metal, not over a coat of paint which may flake off ?

 

[Kev555]

Waxoyl is ok on its own for keeping it from oxidising but grass will stick to it like hell. What you've done already is suffice to use it this summer then clean deck paint again if needed and Waxoyl it before putting it away for winter as oxidising or rusting(steel decks) usually caused by rotting grass not cleaned out before winter storage . sadly alloy decks only have a certain lifespan and get brittle no matter what. Hondas and a lot of mowers of past years have bulletproof engines with a bit of care but sadly decks didnt last.

 

[LostKiwi]

We had a Mountfield. 20 years old and the deck was rusting through. I patched it with aluminium sheet bent to shape and pop riveted. Lasted a year before the engine went bang. The deck was still fine after my patches!

 

[Kev555]

Think it was the Briggs and Stratton engine in the mountfield iirc they were a very good engine from that era, latest ones aren't as good. I have a honda engine sitting in the garage from a 1990 lawnmower. Engine still runs but i dont know why I keep it, probably more for sentimental value as it cut half an acre of lawns for 20 years at my parents home.

 

[Frontstep]

I have heard etch primer was the way to go, but I didn't have any, and there were only intermittent stone chips where the powder-coated paint had broken through. So I used barkeepers friend, which is Oxalic acid to really clean all the crap off and hopefully any oxidised alu where the stone chips were. Obviously scrubbed it 3 times with strong fairy liquid to remove all the Barkeeper !
IF it doesn't last well I will go the etched primer route.

Methinks any good you did with the bar keepers friend was negated by the fairy liquid !

 

[Submariner1]

You used to have to use "special metals primer" before putting hammerite on aluminium.
Galvanising and aluminium are very special cases when it comes to painting so need to use compatible products to avoid the ally oxidising under painted surfaces.
As for the waxoil, surely it should go straight on the bare metal, not over a coat of paint which may flake off ?

i discovered hammerite works fine straight on bare Ally , well better than their water based sp. met primer!

i wanted it painted just to fill the small chip holes in the painted powdercoat.

 

[Submariner1]

Methinks any good you did with the bar keepers friend was negated by the fairy liquid !

Oh dear I see your point drrr
Just as it wasn't a proper primer as such, I wanted to get all the Barkeepers off the paint ( being 98% of the underdeck.

 

[Submariner1]

Waxoyl is ok on its own for keeping it from oxidising but grass will stick to it like hell. What you've done already is suffice to use it this summer then clean deck paint again if needed and Waxoyl it before putting it away for winter as oxidising or rusting(steel decks) usually caused by rotting grass not cleaned out before winter storage . sadly alloy decks only have a certain lifespan and get brittle no matter what. Hondas and a lot of mowers of past years have bulletproof engines with a bit of care but sadly decks didnt last.

thanks I was hoping the Waxoyl, would “set off” a bit like pliable but dry to touch.
Sounds like it will stay as if it was oiled with engine oil :-(

 

[Submariner1]

Think it was the Briggs and Stratton engine in the mountfield iirc they were a very good engine from that era, latest ones aren't as good. I have a honda engine sitting in the garage from a 1990 lawnmower. Engine still runs but i dont know why I keep it, probably more for sentimental value as it cut half an acre of lawns for 20 years at my parents home.

My last one was from 1990 a Honda GxV 140. Ran perfectly till 2007 needed a new steel deck mind. so went for 17 years started first 1/2 pull every time even after winter lay up with some oil in bore.
I did keep it for 2 years .... probably out of sentiment and gratitude ( as my previous mower drove me mad refusing to start )


this one is a GXv 160 think it needs the carb jet cleaned can splutter a bit on idle , then goes fine

 

[Submariner1]

Waxoyl is ok on its own for keeping it from oxidising but grass will stick to it like hell. What you've done already is suffice to use it this summer then clean deck paint again if needed and Waxoyl it before putting it away for winter as oxidising or rusting(steel decks) usually caused by rotting grass not cleaned out before winter storage . sadly alloy decks only have a certain lifespan and get brittle no matter what. Hondas and a lot of mowers of past years have bulletproof engines with a bit of care but sadly decks didnt last.

when you say “get brittle” ... is that metal fatigue? And do they crack? Or what?

 

[ajlsl600]

Think it was the Briggs and Stratton engine in the mountfield iirc they were a very good engine from that era, latest ones aren't as good. I have a honda engine sitting in the garage from a 1990 lawnmower. Engine still runs but i dont know why I keep it, probably more for sentimental value as it cut half an acre of lawns for 20 years at my parents home.

Like everything today. Most Briggs designed to fail. I have a 12.5 It has an alli BORE!! and non replaceable guides.. I have re ringed it 2 x in 2 yr and still can't stop it smoking.. Tho with oil at half level it pretty much stops. At 17.5 hp the motor has iron liner. Might go that way next. Tho then you prob can't get pistons!!

 

[Frontstep]

View attachment 58062

Blimey that's clean, what do you cut with that the lounge carpet ?

 

[umblecumbuz]

A farmer near me spends a couple of days cleaning and servicing his combine after its seasonal use, until it gleams - like new.
Chatting to him about this 'obsession', I realized that it wasn't an obsession at all.

He said that when he needs it the following year he just climbs up, presses a button and off he goes.
Other farmers all around him are phoning the dealers and repair guys, waiting days for parts, and chipping off the dried-on crud.

Meanwhile, he has taken advantage of the weather window, and his harvest is finished and gathered while the other guys are sweating and cursing.

 

[Blobcat]

A farmer near me spends a couple of days cleaning and servicing his combine after its seasonal use, until it gleams - like new.
Chatting to him about this 'obsession', I realized that it wasn't an obsession at all.

He said that when he needs it the following year he just climbs up, presses a button and off he goes.
Other farmers all around him are phoning the dealers and repair guys, waiting days for parts, and chipping off the dried-on crud.

Meanwhile, he has taken advantage of the weather window, and his harvest is finished and gathered while the other guys are sweating and cursing.

I used to live near two farms, one like yours who’d clean and maintain his farm meticulously, the other was an absolute shibber-strauss. Second one was always buying new tractors and implements and dumping the old wherever it died... dragging it to the side of the field if he had to...
The other one had old equipment that always worked. Cleaning and basic maintenance is key to longevity (works for people as well)