Greylady2
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Posts posted by Greylady2
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I think a lot of the problems with two pack coming off in sheets is down to preparation. If there is any mill scale etc the two pack will not adhere to the metals as t drys and cures, thus if there is slight damage water can get behind the two pack and lift it off in sheets. It seems that if two pack is being used shoot blasting in an important part of the preparation to make sure all mill scale is removed and the steel surface gives a good key that the two pack can grip to.
I agree geo, another problem with 2k is that it spider crack on impact when it is or has gone brittle where as something vinyl tar based will just flex.
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To determine the 'correct' revs you need to consult the ammeter. Around 1400rpm should allow the alternator to supply the maximum current. In other words raising the revs won't raise the current. As the battery gets more charged and you see the current decrease so you can drop the revs. Once you're down to around 30A you may find that you can drop the revs right down to tickover.
Thanks Wotever, crikey ive been running the engine around 1300 -1400 until i get to 5amp 100%SOC.
Cheers
Something to be aware of with big motor equipment like pressure washers.
A 2kW inverter should be able to supply about 8.6A - I=W/V where W=2000 watts and V=230 volts which is UK mains.
Likewise you can work out the expected current consumption by the same method. But with big motors there is a problem and it's a bit technical (called Power factor) but it means they take a more current than your calculation would indicate. So when running a big electric motor it is best to not exceed about 70% of the inverter capability so a max of about 1400W for a 2 kW inverter. You also don't want other stuff running when using it with a pressure washer. Even a fridge which does not normally take a lot, but it does when the fridge motor starts.
A pressure washer takes a big surge to get started, a good inverter (by good I mean expensive) should be able to cope but a cheap one may not have the surge capability to start it, so a cheap inverter may not run a pressure washer. It may even damage the inverter.
As an example I had a very cheap 900W inverter and used it with a 600W drill. The inverter released it's magic smoke and was beyond repair.
So when you ask can my inverter run this power washer it is not an easy question to answer.
Added - Basically Horace42 told you this above.
Thanks i decided above that it was a bad idea using a powerwasher from whats been said which is similar to what youve written.
Thanks though.
I am now looking at buying 500w hozelock water pump 3.5 bar, then sucking up canal water them use a sqweejy.
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Ive seen all three of them in mass, if only i took a picture of how many britle big sheets came off, the previous owners used hempel 2k epoxy blacking.Which 2 pack have you seen that is brittle?
The three commonly stated problems with two pack are:
1 Its brittle
2 it lifts off in sheets and the water gets behind it
3 Any local damage will result in severe rusting in the exposed areas.
Does anybody have any first hand experience of these things or are they stories put about by yards who are not able to shot blast?
3 is silly because it would apply just as much to conventional blacking.
Two pack is certainly much harder than single pack but I would not say brittle. We have put a fair few scrapes on ours that have gone right through but the damage is localised with no signs of adjacent lifting or brittleness.
..............Dave
Even though the hull was not shot blasted it was extremely britle to snap and it had cracks in it in places.
Ive used different types of two pack in my job and most of them are brittle or go brittle with age and crack.
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Yep i nearly forgot the weed hatch and the rudder tube.Our boat was 8 years old when we bought her. Previous owner had boatyards do the blacking every two years. I did the blacking diy this year and found the weed hatch had never been done! Do any of you diy's not black in the weed hatch area.?
For OP
I pressure washed wire brushed flakey bits.
& got two full coats and one waterline coat out of a 20ltre tin of Intertuf.
20 littes is what i used on 2 coats but i had a spare 2 days in the dry dock so did another coat.
Sounds like you were lucky my paint come off in shards, it was two pack as well.
I dont rate two pack its very brittle, i use to be a paint sprayer and now i kinda prefer the goopy vinyl tar stuff (it goes on real thick and easily with a fury cloth type roller. :-)
So far Coflex has not greyed.
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Thats the mill is opposite to now Asda, its close to portland basin which was a canal ending re dug out and the building which is now the shop use to be a garage which i helped out in.
Quite strange seeing it as it use to be.
I might be very wrong though a lot of that area and mill buildings were knocked down and turned into a trading estate.
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Crt were towing a Butty collecting everyone's Stoves this afternoon on an Amnesty deal, its not all bad they were handing out Wooly Jackets and the number for the Samaritan's :-/.
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An inverter rated at 12volt 2000w should deliver 166 amps continuously -- which has to match the current taken by the 1800w pressure washer - which in theory is 150 amps but an efficiency factor of about 80% comes into play which means the washer might actually try to pull 187 amps - if that is the case, it is certain not to work successfully.
If you had not asked the question and gone ahead and plugged in the washer and inadvertently overloaded your inverter - it would cut out as you have already found - based on the experience of your microwave, this is because inverters usually have built-in protection devices to sense over-current and low battery voltage to prevent damage from overload and will shut-down automatically if that happens.. So no harm done.
It is not necessary for the alternator, or the engine revs, to be matched to the load of the washer, but it helps. The bulk of the power comes from the batteries - that have to be big enough to supply enough current all the time the washer is running - which in your case with 4 x110 Ah sounds plenty if the batteries are fully charged to start with - but even then the voltage soon drops with such a high load where in practice the engine is usually run at the same time at enough revs to keep the voltage up by sharing enough of the load. But then the over-current protection device operates. Some have temperature devices that trip out when they get hot due to over-load - that take ages to cool down to switch on again. Which could be a bit annoying if you are waiting to watch TV.
The general consensus of other comments here is that using this particular pressure washer it is not likely to be successful.
Thankyou for writing all that Horace i appreciate it.
Yer stuff buying a pressure washer now, i think something that pumps like a hose pipe and is low wattage will do me ok.
Can i ask what engine rev's you charge your batterys at ?
I am running it at 1300 - 1400 revs on a beta 38 100amp alternator apparently. :-/
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You really don't want to be using Fairy Liquid. It contains a surprisingly large amount of salt. Salt and moisture don't do steel a lot of good.
Ow thanks for telling us, ive not used it for ages, ow tell a lie ive used it on the front and rear decks to de mud.
Salt in fairy liquid wow.
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Yer i think your right about the pressure washer getting under the mushrooms more.No its fine,
Yes I do use the mitts but ours are blue. One of us uses a bucket with shampoo in it and the other follows with the squeegee and then another mitt to rinse off by which time one of us is squeegeeing again to get the water off. I find you can almost get the cabin side dry like that, For the roof its a mop and broom. I bet I could get more water through the vents with a pressure washer.
I wash the boat on my own so wash and sqweejy in sections, i use to sqweejy the roof but got fed up of that.
Shampoo ? Hmmm yer that might be better than fairy liquid because i noticed that leaves patches on the blacking like its melted it a bit and it takes off all my wax.
I have just been using canal or water point water on its own and sqweejying.
Lol, omg boaters what they like.
Aww thanks for the link it add's shine too, i will order some.
:-)
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I always found Muc-Off Marine Cleaner to be great for stubborn stains and green bits. It's biodegradable and in a hand spray. Then rinse off with canal water and a mop.
Thanks whatever i will look it up.
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Filling up your watertank will take as long as it takes, you just tell the first one that arrived while you are filling that you'll tell them when your tank is full.
Of course filling your watertank isn't the same as washing your boat with drinking water.
Peter.
Yer i should just tell them when its full.
It is a bit norty washing the boat as well though. :-/
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Yer i can see why fresh water is fround upon, i nearly always dunk my brush in the canal to wash the boat and ive only used the water point twice.I don't know about the UK, but here it's (officially) forbidden to wash your boat with drinking water, pre-filtered canal / river water is plenty good enough to wash your boat.
Peter.
People come from every direction asking me how long i am going to be when filling up the water tank.
I should tell them about an hour rather than move half empty.
I have a sqweejy, but do you really wear them mitts lol.Whats wrong with a bucket.
I find these Micro Fiber mitts very useful.
Something like this http://www.tesco.com/direct/rolson-microfibre-wash-mitt/641-4873.prd
followed by a squeegee like this https://www.amazon.co.uk/Triplewax-CTA125-Water-Blade-Squeegee/dp/B004YBOOOE
Buckets take ages and they splash up under the mushrooms wetting the boat inside.
Thats what i find anyway.
Edit :sorry ditchcrawler i was a bit cheaky in my post i was only joking about the mitts.
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About £115 pe tonne.
Starts up my engine and heads down to the scrappers yard.
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No you are not paranoid just careful of your safety which is perfectly OK
Are you talking about me lol.
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Thanks for all the replys, i guess i better look at something that draws less power than a power washer, i cant keep washing the boat on a water point. (People get all nasty) lol
I was just looking at this water pump from hoselock, its 500w and runs at 3.5 bar, i suppose i could suck up canal water and leather the boat off with a shamy after.
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Cheers again everyone.
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No - one is enough (at my age)
Hahaha
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Coconut
Extra Virgin
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Weird thing !
My pump has not burped all night.
Strange
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I thought everything that is burnt is carsogenic.
Bloody hell, i say enjoy life stay warm and dont become a pansy. Lol
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Thanks Chewbacka a good post.
I will do another check of the floor hatches for water and fit that night time water pump switch.
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Thanks for the reply's, when i did the blacking on our boat i knew i was in for a big job and to be honest quite paranoid/mistrustfull of giving handing the boat of to a boat yard to get the blacking done, ive heard a few horror storys on here before we bought the boat. (One even sank after shot blasting and being blacked)
I am sure their are some boat yards that do a proper job and treat the boats as if they were doing their own but i very much doubt all break their backs on preping the boat before blacking it.
When i power washed our boat the blacking came off in sheets in places because it was never shot blasted so it had mill scale which obviously is not a good surface for any paint.
I know a few new boat builders who are selling boats and not shot blasting their hulls prior to handing a very expensive boat over to their customers, a few ive spoken to have had to shell out big money on shot blasting once they had used a power washer for the first blacking.
I ended up scratching my head when i power washed our boat thinking omg this is gonna take ages and it did take ages.
About
60 36 grit grinding discs
25 belt sanding discs
35 hours of prep
30 litres of coflex
24 hour between each coat of paint x 3
48 hours curing before it went back in the water
4 x Anodes
Total cost
Cost around £1000 DIY
I made the mistake of trying to live ln the boat after the first coat of coflex.
(Do NOT do this), the fumes from just applying that stuff never mind sleeping above the hull burned my eyes really bad and it was like having grit in your eyes.
I should of worn goggles < wolly
Anyway it's nice when its done but i am not looking forward to next time.
I am still kicking myself because i never used any primer.
Maybe someone can give advice on what works with coflex or comastic ??
Edit to add: dont forget to do the rudder tube like i did until the very end.
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Chat tommorow you lot.
Nan night
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Yes it does damage your blacking.
And you might get people shouting at you that you are damaging theirs by pushing sheets of ice about. (And also potentially puncturing GRP boats)
But....................................
Its great fun and the breaking ice makes a wonderful noise
I could be a potential shouter. Lol
Then again i respect working boats that need to move to help us all.
I dont fèel comfortable saying where i live. (I am paranoid) but mean well.
How do you go about blacking your boat?
in General Boating
Posted · Edited by Greylady2
17 years as a qualified painter sprayer motor trade/comercial coatings and aviation.
Guess i better shut up and keep my nose out.