Dr. Fixit Torchshield Primer — Bitumen Primer for APP Waterproofing Membrane Systems

Dr. Fixit Torchshield Primer is a bitumen-based preparatory primer from Dr. Fixit Waterproofing Solutions — specifically designed for use as the first step in APP waterproofing membrane systems before torch-on application of bituminous waterproofing sheets on roofs, terraces, and structural surfaces.

A primer is not optional in a proper bituminous waterproofing system — it's what makes the membrane perform correctly over time. Torchshield Primer penetrates and seals the concrete or masonry substrate, closes surface porosity, and creates a uniform, tack-ready surface that allows the APP membrane to bond firmly and completely. Without proper priming, APP membranes can delaminate, allow lateral water migration, or fail prematurely under hydrostatic pressure — regardless of how well the membrane itself is applied.

Applied by brush or roller directly onto the prepared substrate, Torchshield Primer dries to leave a continuous bituminous film that chemically prepares the surface for the heat-fused bond during torch-on installation. It's compatible with Dr. Fixit's range of APP waterproofing membranes and is a standard requirement for roof waterproofing, terrace waterproofing, and basement waterproofing applications where long-term system performance is the goal.

For waterproofing contractors following a proper system approach, Torchshield Primer is the critical first step — the construction chemical component that ensures the entire waterproofing solution performs as designed from day one.