Envirothane 8470 Water based Polyurethane

No, an epoxy such as E2000 or E2100 is normally applied first as epoxies handle the alkaline nature of concrete better. The epoxy would normally need a light sand unless overcoated within the specified window.

E8470 is a Satin finish.

The mixing rations are very important. They are very simple:

1. E8470 is 8 parts Pack A to 1 part Pack B

The best way to mix the two components is by a power stirrer. Normally, these are operated by a variable speed battery drill. Mix thoroughly (for at least 2 minutes) until the combined product is consistent and thoroughly blended, and then allow the paint to sit for 5 minutes. In lower temperatures, stir again briefly prior to use

Very – if it isn’t observed, colour and gloss variation will occur and ultimately, the mixed product will become unusable.

Temperature and humidity are both important. Temperature needs to be at least 10ºC, and relative humidity must be no greater than 75%.

This depends on the circumstances. In large areas, spraying by airless may be the best option. Some helpful hints here are:

1. Thin E8470 with water to spraying viscosity – try 5% first (thin only after mixing Pack A and B together.)
2. Use a medium/course gun filter
3. Pump pressure approximately 1750 psi
4. Take care to adequately mask nearby sensitive and finished surfaces – epoxies can float wet for a long way
5. Work fast to maintain a nice ‘wet-edge’.
6. Make sure you thoroughly purge the machine and line with water before introducing E8470

Roller and brush is also fine and is probably the more suitable method for small areas. Use a tight weave microfiber roller with a 12mm nap length. For large floors, 460mm rollers may be useful.

Spraying is faster and traditionally provides a better finish (no roller ‘lap marks’ or stipple), but it requires expensive machinery and overspray needs to be controlled.

E8472 especially will

E8470 may exhibit carbon dioxide bubbles if applied too thick, so do not leave heavily built up areas.

This provides a guide to how much paint you are likely to use. It will vary depending on:

1. The size, or area being coated – larger areas normally give a better ‘coverage rate’.
2. The condition of the substrate – for example, pitted floors will need a heavier coating than very smooth floors
3. The expected wear to be imposed on the floor – in high traffic areas, a heavier coating is recommended
4. The colour – some strong colours will require extra coats for full colour coverage

The following is a guide from field experience, although this will obviously vary from project to project.

Spray Application:

1. E8470 thinned 5% with water – 7m²/litre

Roller Application

1. E8470 Unthinned – 7m²/litre

E8470 is virtually odourless, but does release some Isocyanate when sprayed. Proper PPE must be used, and other trades working in the area should be avoided.

E8470 has good flow properties. Always roll in both directions – i.e. north/south, and then east/west. Unfortunately, it is often impossible to completely eliminate roller marks.

For the best finish, we recommend letting the E8470 dry overnight.

This depends on the weather and the type of traffic that will be using the floor. If it is in summer and the main traffic is foot or pedestrian, overnight dry may be adequate. If it is winter time and the floor needs to handle trucks, 3 days should be aimed for.

A Polyurethane will continue to cure for weeks. We recommend placing mats under car tyres for the first month.

NB: Some recent tyre formulations tend to impart a stain. Some applicators recommend only dark flake for car storage areas on this account. A & I Coatings is currently doing extensive research to combat this phenomenon.

Yes it is UV stable and excellent for external use. Two coats must be applied for UV stability.