ISOTHANE PU PRIMER Polyurethane Primer
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Description
PU PRIMER is a specialised, high adhesion primer system
designed to improve adhesion between a large variety of
coatings and substrates. PU PRIMER is particularly suitable
when used in conjunction with Isothane Elastomeric Membrane
coatings or Isothane foams. It is a special blend of moisture
curing urethane prepolymers in solvent and its chemical similarity
to EM coatings ensures good adhesion between the two within
the specified overcoat times. It acts as a sealer on porous
substrates such as concrete and will consolidate a friable
substrate such as that of asbestos cement. It acts as a barrier
coat on bituminous substrates and improves adhesion to difficult
substrates such as non-ferrous metals.
References to the specific application of PU PRIMER are made
in the Isothane Data and Application Notes.
Preparation
General:
- All surfaces should be sound, clean, dry and free from oil or grease
- Remove loose material and flaking paint
- Brush and wash off soft or powdery surfaces
- Remove rust and corrosion from metals
- Abrade smooth metal, plastics and fibreglass surfaces
- Allow 28 days for new concrete to cure and before removing laitance and applying primer
Roofs:
- Remove dust, dirt and loose chippings
- Kill fungal growth with fungicide and wash off thoroughly
- Fill cracks and voids with exterior mastic
- Cut open felt blisters, apply EMB underneath and tack down. Allow for evaporation of moisture.
Application
Apply PU PRIMER straight from the can by brush or spray. One
application will normally suffice but some highly porous
substrates may require two.
Cleaning
Use aromatic hydrocarbon solvent for cleaning equipment etc.
Storage, Handling and Personal Protection
The recommendations in our Safety Data Sheet for this product must be followed at all times.
More general information is included in our publication “A Guide to the Safe Handling of
Polyurethane Resins” and in the following Technical Data Sheets which are available on
request:-
- Fire Safety when Storing, Handling and Installing Polyurethane Foam
- Decontamination of Isocyanates using Isothane Decontaminant
| Technical Data |
|
| Form |
Slightly hazy, pale straw liquid |
| S.G |
0.90 |
| Flash Point ºC |
31 |
| Application rate |
Between 6 - 10m² / lt dependent on substrate texture and porosity |
| Cure/Drying Time |
Slightly tacky film in 2 - 4 hours |
| Overcoat Time |
Min 2 hours, maximum 48 hours. When applying to bituminous
substrates allow at least 4 hours before over-coating |
| Application |
0 - 70°C |
| Shelf Life |
6 months |
|
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