Brown Silirub 2 is a 100% silicone, and that matters more than it sounds. Everything else in a cartridge is filler and extender - even a good LMN runs 90 to 95% silicone - and it is the filler that shrinks back as the joint cures and ages. A 100% silicone has nothing in it to go anywhere, so the bead you tool is the bead you have still got in five years.
The other reason to step up is glass. Soudal state Silirub 2 is compatible with most insulating-glass edge seals and conventional PVB laminated films. Silirub LMN explicitly is not - their own sheet says so. If the bead touches the edge of a sealed unit or a laminated pane, this is the one.
A dark woodgrain brown. If you are matching Rosewood, the named Rosewood in this range is the one to go for.
Being neutral cure it will not corrode metal or stink the place out the way an acetoxy silicone does, so it is as happy on anodised aluminium, stainless steel, lacquered wood and ceramic tile as it is on uPVC. One thing Soudal are clear about though: do not use it on natural stone such as marble or granite, because it can stain. Use a proper stone sealant there.
✔ 300ml cartridge, fits a standard skeleton gun
✔ 100% silicone - no shrinkage as it cures
✔ Low modulus neutral cure - stays flexible with joint movement
✔ Very fast skinning and final cure
✔ Primerless adhesion on most surfaces
✔ Internal and external use, UV and weather resistant
Where it sits in the Silirub range: Silirub N is the entry level neutral cure, Silirub LMN is the grade most roofline and window work gets done with, and Silirub 2 sits above both. Silirub 2 is also where the named woodgrain colours live - Oak, Rosewood and Toffee - so it is usually the answer when an exact woodgrain match matters.
Not sure which colour you need? Give us a ring - we sell the roofline as well as the sealant, so we can tell you what goes with what.