![Darren McLean on X: "Been asked a few times recently about mastic around windows. It's mostly done these days in inferior 'trowel mastic'. Mastic is actually a tree from Sudan which provides Darren McLean on X: "Been asked a few times recently about mastic around windows. It's mostly done these days in inferior 'trowel mastic'. Mastic is actually a tree from Sudan which provides](https://pbs.twimg.com/media/EEkfoSoXoAA21DE.jpg)
Darren McLean on X: "Been asked a few times recently about mastic around windows. It's mostly done these days in inferior 'trowel mastic'. Mastic is actually a tree from Sudan which provides
Darren McLean on X: "Been asked a few times recently about mastic around windows. It's mostly done these days in inferior 'trowel mastic'. Mastic is actually a tree from Sudan which provides
![Trowel Mastic A multi-purpose, trowel grade material for waterproofing, stopping, bedding, pointing and sealing. Trowel Mastic A multi-purpose, trowel grade material for waterproofing, stopping, bedding, pointing and sealing.](https://bond-it.co.uk/uploads/product/zoom_Trowel_Mastic_93690.jpg)