Soudal Fix All High Tack Invisible MS Polymer Adhesive Sealant

Soudal Fix All Clear in its High Tack Invisible form is one of those tubes that earns its place in a tool bag pretty quickly. It is a single-component MS Polymer adhesive and joint sealant that bonds fast, cures strong, and dries to a transparent finish — which matters more than people often think when you are working somewhere visible. No silicone shimmer, no yellowing, just a clean, near-invisible bead that stays put.

The MS Polymer base is what separates this from a lot of grab adhesives on the market. It contains no isocyanates, no solvents, and no silicone. That means no nasty fumes, no compatibility headaches with paints or coatings, and no waiting around for primer to do its job. You apply it directly to most surfaces and it bonds. High initial tack reduces the need for propping or clamping while things set, which on a busy site is worth a lot.

Where Soudal Fix All High Tack Invisible Gets Used

This product cures to a permanently elastic joint, which is important wherever you have movement. Vibrating constructions, expansion joints, areas where substrates expand and contract seasonally — a rigid adhesive in those situations will crack and fail. The elasticity here is not just a feature for the brochure, it is why the bond lasts.

Weather resistance and UV stability are genuine strengths of the MS Polymer chemistry. Soudal Fix All Clear will not yellow or degrade outdoors in the way silicone-based products sometimes do, and it handles wet substrates at the point of application, which is a practical advantage when you cannot always wait for a perfectly dry surface.

Paintable and Mould Resistant

Once cured, this adhesive accepts water-based paints without any issue. That matters in internal applications where you need a decorated finish over a sealed joint. It also carries mould resistance, making it a reasonable choice in kitchens and bathrooms where there is regular moisture exposure. Not all grab adhesives are suitable in wet-area joinery — this one is.

Colour stability over time is another point worth noting. Some clear sealants start clear and end up somewhere between cream and light brown after a few months of UV exposure. Soudal Fix All Invisible is formulated to hold its appearance, which is particularly relevant in glazing applications, display work, or anywhere the sealant line will be seen.

Application runs from 5°C to 35°C, which covers most working conditions in the UK without needing to heat the cartridge or delay the job. It goes through a standard manual or pneumatic caulking gun, standard 310ml cartridge format. Joint widths from 2mm for bonding up to 30mm for sealing joints, with a minimum depth of 5mm for joint applications. Joint width should ideally be twice the depth — the standard rule that most sealant manufacturers follow and Soudal are no different here.

For builders, joiners, glaziers, kitchen fitters and anyone who needs a clean, strong, and lasting bond without a visible bead of adhesive announcing itself — this is a product worth keeping in stock.