This stuff can go very sticky after a time and needs to be cleaned off and
re applied.
Its normally dry heat that does this. I'm not an expert on vertical blinds,
but in this case the issue sounds more like either premature wear or poorly
fitting parts.
Brian

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"GB" wrote in message
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On 30/06/2018 22:06, GB wrote:

I sprayed lubricant on a difficult curtain track. Worked a treat. I can't
remember what I used, but nothing oily. Possibly Teflon?



Found it. Silicon Spray.