Substrate Priming for Industrial Floors
Substrate priming is first step of any industrial flooring system. Below are some important points regarding purpose, technologies and techniques of substrate priming.
I. Purpose of substrate priming for industrial flooring
- Prevention of air from the substrate appearing as pores on body-coat
- Dust binding
- Pore sealing – when different degrees present
- Reduction of consumption of body coat
- Cost reduction of overall system
- Improvement of bond strength of successive layers
II. Available technologies
- Mortar slurries (+ latex or acrylic polymers)
- Epoxy resins + fine aggregates or thickeners
- PU modified screeds
III. Important time concepts
- Shelf life – Time to store the material
- Pot life or Application time: Time to place the mixed material
- Walk-on time: Time to step without (much) damage
- Open time:Time to place the next layer
- Service time: Time when material has sufficient performance properties to start service.
IV. Effect of primer age on performance
V. Why broadcasting?
- The finer the aggregate, the better the grip / bond strength à greater specific surface
- The coarser the aggregate the more air is entrapped.
- Insufficient primer consumption is detrimental for good results.
- (Whether due to excessively absorbent substrates or lack of coverage)
VI. Primer dilution
- Not applicable to every flooring technology.
- Can be used on some acrylic dispersions or some water based epoxy primers
- Helps improve penetration on dense substrates
- Reduces cost of first primer coat on excessively porous primers