Injecting underside cavities with Corrolan Active Cavity Wax.
So, our Fe-123 is curing turning a dark purple/black colour which is showing we’ve a good conversion and it’s time to mask the vehicle whilst this is taking place.
At Rustbuster we use the Indasa masking cover rolls, these comes in 3 different sizes, 600mm, 1200mm and 1800mm and a roll is 25mtr long, we use this to fully wrap the vehicle.
We also use shrink wrap or carrier bags to cover wheel hubs covering and brown paper for masking any coil over suspension shock absorbers, heaters on motorhomes etc we mask anything we don’t want a heavy layer of wax on or want to have to spend time removing.
Once this is all done, we’ll blow the vehicle down of remaining dust ready to rust proof.
Next Step, Injecting Cavity Wax to the underside.
So, you’ve set up the compressor, attached the hose and have your injection gun ready to go. All waxes in there cold state are pretty hard and have the viscosity of a breeze block, to reduces these waxes you’ll either need to apply energy or heat.
As you can shake the can for hours heat is simply the best option, drop the container of wax into a bucket of boiling water (remember to keep the water hot) once thin enough to be shaken like water the wax is ready to spray. In colder months this will be more of a challenge as soon as you remove the wax to fill your guns reservoir it will start cooling.
Fill up the gun, screw the container to the gun and let’s go.
Rustbuster have a number of injection drawing for classic vehicles and can supply these with your purchase of Cavity/Underbody wax these diagrams like below will show you where to inject
VW Caravelle Injection Drawing
Whilst injection drawings are handy you can work out quite quickly when underneath what needs to be injected where, typically during this process you’ll use the 360° wand that comes in the kit.
This wand sprays the wax in a 360° pattern and can be pushed 500mm onto a cavity. When I’m injecting wax, my mission is to get everywhere that I can’t spray from underneath concentrating heavily on sills, behind suspension components, hollow sections to stiffen floors etc. On Land Rovers special care needs to be taken to make sure you get to the side of the bulkhead. Your vehicle may have a known underbody rust spot, if so, now the time to protect it.
One of the biggest questions we receive when cavity waxing is how much wax do I need to inject? On average I would suggest for an old Mini 1.5-2ltr, new Mini 2-3ltr, Land Rover 90/110 3.5-4ltr.
Once I’ve inserted the injection wand how fast do I remove it? It’s a tricky one, you don’t want to move so fast that you leave no wax or so slow that you over fill the area, this is a bit of trial and error I guess (I’ll try and produce a video on this).