Below is the Paasche R-75 Regulator and Moisture Trap which combines a water trap with an air pressure regulator and gauge for controlling pressures up to 100psi, which should be suitable for most airbrush compressor pressure ranges. The moisture allowed through then condenses from vapour into small liquid water drops in the hose and ultimately mixes with the paint. While this result occurred due to high ambient air humidity, you may find that you are much more susceptible to this with lower air humidity if you don’t use a water trap on your compressor.

Ambient Air Interior Dehumidifier x12 | Home Bargains

As stated before, it is not a sealed box. Any humidity catching is much like turning on the aircon in a car with the windows open, or leaving your freezer door open. You will soon find a puddle of water under your car from the condensed air or the same from your freezer. By trying to remove the humidity from the environment in your caravan, you will start making it less humid than outside. Your paintwork will become much more susceptible to problems with humidity in the air resulting in water being atomised with your paint when it is being airbrushed. So if you’ve ever seen the question asked, “ how do you stop water from getting into the airbrush while spraying”, the answer is a water trap. Ambient air moisture trap (case of 12) offers and online promotions, straight from the current Home Bargains leaflet

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Our range of dehumidifiers are compact and ideal for use throughout the home, office and leisure environment. They fit on windowsills, inside drawers, on top of cupboards or even hang from wardrobe rails. Because of this movement in air, it brings fresh air which contains moisture which replaces that which you have tried to remove with the traps. If you’re savvy with this sort of thing it can certainly be done, with some brands making the process relatively simple.

Ambient Air Moisture Trap x12 | Home Bargains

Use our hanging wardrobe dehumidifiers, Our mini moisture traps in draws or cupboards, wherever you need a control dam.The New Aqua Trap and top selling. Streamline Moisture trap in the kitchen or living room and for extra capacity the Mega moisture trap Paint Fisheyes or Paint Dimples: these are small dimples in the paintwork caused by too much moisture in the paint; Having a water trap to stop moisture mixing with your paint will always be more beneficial over not having one, but if you only do a little casual airbrushing in an environment that’s not overly humid then you should be fine without one.The words water trap, moisture trap and moister filter can be used interchangeably when talking about airbrushing compressors, and for the rest of the article I’ll use the term ‘water trap’. Personally I think they are a waste of money. When you consider how many vents are in the average modern van all you will be doing is removing moisture from the air for it be replaced by more coming into the van. The important thing (as mentioned above) is to correctly winterise the van if you aren't going to use it for sometime as most of the issues you can get won't be of concern during the spring & summer when the van is in use. They won't stop damp in a van as this (as mentioned above) is caused by water ingress, normally due to a leak on a seal somewhere.

Kilrock Damp Clear Moisture Trap | Wilko Kilrock Damp Clear Moisture Trap | Wilko

Typically it water trap will be a small glass bottle situated between the compressor/tank and your airbrush, most often bolted directly to the tank or frame it’s held in. If you place a trap you will find it attracts moisture, this in turn drives you to get another one, eventually you convice yourself you have a major problem. It is by the nature of the crystals in the trap that they attract moisture, so you could place on in your kitchen and see it fill up. A suacer of salt will do the same. Alternatively, you can get water traps that connect to the bottom of your airbrush and do essentially the same job, the only problem being that the airbrush can be a little unwieldy to operate if the water trap is substantial in size and/or weight. For a trap to be of any benefit in removing moisture it would require that the air in the caravan be static, due to the natural ventilation from around the windows and the holes in the floor, the air in the caravan changes on a regular basis. The only way to ensure you don’t experience fisheyes and associated paint problems is to spray when the ambient air isn’t as humid.

Ambient air moisture trap (case of 12) offers and online promotions, straight from the current Home Bargains leaflet

We see this moisture when condensations forms on our windows, an unsightly patch of damp forms or wallpaper or paint work begins to peel or flake. Excess atmospheric humidity can also cause damage to structural wood, furniture, car body work, boat hulls as well as causing unwanted odours and/or musty stale air both of which are detrimental to health and well-being. Below is the Iwata DHCL Moisture Filter which uses a high quality five micron filter to remove unwanted moisture particles. It can be attached directly to the compressor or inline between two air hoses, and comes complete with PTFE tamp and various adaptors.