The Trade 4+ does not require fluid, it uses an impregnated Vapour Mate Pad. These work like the Trade 20's fluid whereby they produce the vapour that keeps the brushes soft and pliable for a prelonged periods of time.
There is a 'tell tale' indicator on each pad gives an indication of when it needs changing. When the star in the 'window' noticeably fades in relation to the other star it is time to replace the Vapour Mate. Typically a Vapour Mate may be expected to last up to 6 months when used for DIY use but as professional users open the lid more frequently, they will need to change their Vapour Mate more often.
This again is dependent on useage and climate.
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