When cleaning I start by running through a thinner that I bought from the hardware store, just to get the bulk of the paint out. It's a fraction of the price of the "hobby" branded thinners.
After that I finish off the clean with the hobby brand cleaner, either humbrol or X20.
Over here you can buy a big bottle of enamel thinner (several litres) from the hardware store or a smaller bottle (about a litre I think).
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Tyranid Horde wrote:...and apparently Vallejo's airbrush cleaner does the same but not as well (not very well at all, but you can scrub!).
Vallejo's airbrush thinner doesn't even work well with alcohol based acrylics (turns it into clumps that are likely to block it up), I can't imagine it working well with enamels.
Also regarding thinners eating your seals, if you have an airbrush with teflon seals I think they'll be fine with most thinners (I haven't checked every thinner, but I only use my teflon sealed brush when running lacquers which have a horribly harsh thinner).
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lliu wrote:Otherwise if this is the only way, is there a way to use smaller amounts of thinner in order to wash an airbrush completely?
The least cleaner-consuming way I've found is to put just a small drop in the cup then wipe out the bulk of the paint with a paper towel or a tissue (pull it out of the cup, don't spray it through) and then another small drop and use an old brush to clean around the bottom of the paint cup and into the paint passage a little bit, again try and dump it out of the cup.
That will get rid of the majority of the paint with only a few drops of cleaner, then you should be able to clean out the rest of it with a lot less cleaner.