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MG Midget and Sprite Technical - best time to waxoyl

seeing that the weather is hot at the moment i thought it might be the best time to waxoyl the car .Going to try using an old spayer for doing it, i think it was made for spaying oil into aero engines when they were laid up.


mark heyworth

Looks decent and may do a good job especially with the temps at the moment. I have used the normal waxoyl sprayer in the past and found it fairly useless so made a couple of atomising lances that used compressed air to break up the wayoxl into a mist and assist distribution with the waxoyl pressure chamber just being used to push the fluid out to the spray head, it still helped the flow to heat the waxoyl with the likes of a fan heater and make sure it was consistently fluid throughout.
David Billington

yes it has a nozzle on it that spins when spraying oil is pressured so seems to mist well


mark heyworth

Spraying cavity wax is always best done in hot weather as it encourages it to run and creep into the seams. Beware, it will drip out all over the place so you may want to put newspaper under the sills etc.

Personally I don't like Waxoyl as it is too thick - if you are going to use it in cooler weather, thin it down with white spirit. Dinitrol cavity wax is my current favourite, but it only come in those Schutz cans, so might not be suitable for your gun.
Mike Howlett

I gave up on Waxoyl many years ago for cavities as for me its too thick and I think there are now better products out there.

I use this for cavities and it gets good reviews.


https://www.bilthamber.com/corrosion-protection-and-rust-treatments/dynax-s50

richard b

That's the stuff I have bought for when I have finished the painting on my Sprite. They supply a good extension lance too.

I started to apply some inside the rear wings after I had painted the interior but found that it crept so much that it began to appear in odd places on the outside, before the outer paintwork was done, so I had to stop. But it does proove how well it creeps into seams!
GuyW

Hi Richard (ETA: and now Guy),
how do you extended the lance to reach further than 2 foot and does the aerosol propel the addition length (sill is more than 2 foot back from jacking point)?
Nigel Atkins

One of the items I made is shown in the image, the lance end is brake tubing held in with a standard brake line nut so other lances are easy to make. Internally the fluid tip pokes slightly into the flared end of the brake line with enough annular clearance for the air to break up the fluid stream and take it down the tube. The other one had 2 tubes one inside the other with air in the outer one and fluid in the centre so the air aided atomising the fluid, overall diameter about 10mm and about 1.75m long which was useful for things like a GT6 chassis job as it only needed a hole at each end.



David Billington

Nigel, the lances are long enough for the front and a bit short for the rear of the cill with a single jacking point.
Its only a bit of tube so can easily be extended or replaced with washer tube. ISTR when I first did mine I had access from the rear wing inside the car as it was still a shell. Seatbelt anchorage hole ???
The lances do have a very good spray pattern - well the old ones did they were brass - think they may now be plastic but still quite good.
As the fluid is so much thinner than Waxoyl it does really penetrate as Guy noted. The thinners must then evaporate over time and leaves a good coating.

David - that pic brings back so many nightmares with their various application guns I've tried over the years, hot water etc - never again !!!
richard b

Richard,

That's why I gave up on the Waxoyl lances and made my own as they work so much better, the pressure can is fine for pushing the fluid along it just needs to be warmed to make sure all is evenly fluid, not a problem today!
David Billington

Thanks Richard, I thought the lance might be extended but wondered if the aerosol had enough guts to push the s50 the extra length. Guess there's only one way to find out for sure.
Nigel Atkins

The aerosols are quite powerful but the spray jets are drilled at 90 degrees ? to the lance end and hence give a good spray pattern within a closed section (6 tiny holes on the brass type) - so it may be worth extending the hose a bit to easily get to the rear cill ends.
richard b

Do you all do it on your cars ? Once a year ?

The more time I spend under the midget, the more I think I have a lot of "non-through" rust everywhere, which is fine IF it doesn't continue to make its way...
CH Hamon

So is Bilt Hamber recommended then?

I had a stock of 'old' Dinitrol which has lasted well but is now more than likely in need of refreshing and it seems Dinitrol is not what it was.
Jeremy MkIII

So what's the recommended technique for using the Bilt Hamber aerosol cans then please?

Press spray button for how long and withdraw probe how far before next press?
Nigel Atkins

Nigel, if you are serious about this, then make up a dummy box section from cardboard, to the dimensions of a Midget sill. Conect your extension tube to a Bilt Hamber aerosol, and try a single practice run. Then cut open the cardboard sill and check the resulting spray pattern. You should learn how effective the spray pattern is and be able to adapt your withdrawl technique to make best use of your probe.
GuyW

Bit messy and a waste of materials but I take your point, I could use cling film for the top as a real time viewing panel.

I was just hoping someone would have some dancing like instructions, spray one-two, reverse one-two, ...
Nigel Atkins

The instruction actually says to insert the probe to it's furthest extent, then depress the trigger to spray continuously, whilst steadily withdrawing the probe. It doesn't say how fast to do this. I suppose that is down to guesswork, biyt the Bilt Hamber spray cans seem to be at a higher pressure than most aerosols so the treatment fluid is expelled quite vigorously.
GuyW

That was my concern, a couple of cans of lubricants have lost most of their propellant with the cans only half empty of lubricant.

I was thinking you'd start working at the farest points and then if required cut the probe shorter so you could empty the can at the nearest points.
Nigel Atkins

Why would you cut the probe? You just withdraw it as you spray. The length of the probe has little if any effect on the spray pressure at the spray tip at the end
GuyW

I was thinking if the pressure was dropping towards the end, I've no idea how high pressured these cans are and their consistency of pressure but by your experience I won't worry about it, thanks.

The lubricant cans dribble over my fingers more than spray - and I'm only young!

I hold the can with two hands and get eight fingers wet.


Nigel Atkins

This thread was discussed between 28/06/2019 and 06/07/2019

MG Midget and Sprite Technical index

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