If neoprene rubber has been talced, this should be removed by washing with detergent or wiping with a solvent-soaked rag. Liquid Rubber can be applied directly to neoprene. Some swelling of the neoprene should be expected, but this will recover over time. The distortion resulting from the swelling will be greater if neoprene is thin and not adhered to a rigid substrate.
A light sanding of the surface is recommended for better adhesion. No swelling will occur.
Do not use Liquid Roof or Liquid Rubber on the following substrates.
For the below applications, you can use the asphalt-based system located here: Asphalt-Based Repairs
Built-up asphalt roofs
TPO (Thermoplastic Olefin) First needs to be primed with the Proflex Primer
RV owners with Alpha roof's need to prime the roof first with the Proflex Primer
Modified-asphalt roll roofing
Trafficked areas such as decks or patios
Stainless steel, glass, silicone, caulk, foot-traffic surfaces, Hypalon membrane