Passive Purple Brush - The need to KNOWS!

This is Passive Purple BRUSH. The fibre reinforced version of Passive Purple Airtight membrane. This product was made with polymer fibres that bridge gaps and strengthen/bond hard in high movement and common air leak areas. use like a filler in some respects Passive Purple brush is simply hand painted on around areas such as joist zones, window formers, service penetrations and and nook and cranny that needs sealing. with this highly elastic toughened airtight polymer you can bridges gaps, cracks, and connections of up to 5mm and not have to worry about building settlement. this product unlike silicones and adhesive tapes is so easy to use and sticks to pretty much any substrate! and unlike most other products Passive Purple Brush does not shrink or deteriorate over time or lose its effectiveness!
This product is VOC FREE and has an airtight score of 0.03ach on any substrate its adhered to.

[@janwillem6953]

Can this be applied from the attic down onto the slab and joists as part of a retrofit with no internal disruption?