Sikalastic®-518 Pronto Topcoat
Sikalastic®-518 Pronto Topcoat is a two-component, fast-curing, flexible seal coat based on PMMA resins, serving as the finish top coat of the Sikalastic® Pronto systems.
- Very fast curing, even at low temperatures
- Good mechanical and chemical resistance
- Good UV-resistance for exterior exposure
- Solvent-free
Usage
- Seal coat finish over the broadcast layers in the Sikalastic® Pronto RB-5700 PUMA system for multi-storey and underground carparks, intermediate and exposed decks.
- Suitable for both interior and exterior parking deck traffic applications.
Advantages
- Very fast curing, even at low temperatures
- Good mechanical and chemical resistance
- Good UV-resistance for exterior exposure
- Solvent-free
Packaging
| Part A: Sikalastic®-518 Pronto Topcoat | 18.9 L (5 US gal.) pail |
| Part B: Sikafloor® Pronto Hardener | 25 kg (55 lb) bag (sold separately, see Mixing Ratio chart below for dosage) |
Colour
| Part A: Sikalastic®-518 Pronto Topcoat | Liquid / Transparent, bluish (can be pre-tinted to RAL 7012 Basalt Grey, RAL 7015 Slate Grey or RAL 7046 Telegrey 2. Custom colours available upon request.) |
| Part B: Sikafloor® Pronto Hardener | Powder / White |
Product Details
Composition / Manufacturing
Reactive acrylic resins
Shelf Life
From date of production:
| Part A: Sikalastic®-518 Pronto Topcoat | 12 months |
| Part B: Sikafloor® Pronto Hardener | 12 months |
Sikafloor® Pronto Hardener must be protected from heat, direct sunlight, moisture and impact.
Storage Conditions
Sikalastic®-518 Pronto Topcoat and Sikafloor® Pronto Hardener: Store properly in original, unopened and undamaged sealed packaging, in dry conditions at temperatures between 5 and 30 °C (41 and 86 °F). Materials must be protected from heat, direct sunlight, moisture and impact. The materials should be stored between 18 to 24 °C (65 to 75 °F) for 24 hours prior to use for optimum handling properties.
Do not store near open flame or an ignition source.
Density
~ 0.98 kg/L (23 °C / 73 °F)
Solid content by weight
~ 100 %
Solid content by volume
~ 100 %
Temperature Resistance
| Exposure* | Dry Heat |
| Permanent | 50 °C (122 °F) |
| Short-term max. 1 hour | 60 °C (140 °F) |
Short-term heat* up to 80 °C (176 °F) where exposure is only occasional (steam cleaning etc.)
*No simultaneous chemical and mechanical exposure and only in combination with Sikalastic®-511 / -532 Pronto as a broadcast system with approx. 3 - 4 mm thickness.
Chemical Resistance
Resistant to many chemicals. Contact Sika technical service for specific information.
Application
Mixing Ratio
The amount of Sikafloor® Pronto Hardener required to be added to 9.5 L (2.50 US gal.) or 9.31 kg (20.52 lb) of Sikalastic®-518 Pronto is dependent on the ambient and substrate temperature.
| Temperature | Sikafloor® Pronto Hardener (% by weight) |
| 0 °C (32 °F) | 559 g (19.7 oz) - (6 %) |
| 10 °C (50 °F) | 466 g (16.4 oz) - (5 %) |
| 20 °C (68 °F) | 186 g (6.5 oz) - (2 %) |
| 30 °C (86 °F) | 93 g (3.2 oz) - (1 %) |
The hardener powder can also be ordered under the product name Sikadur® VPC Part B (280 g / 9.87 oz bottle).
Ambient Air Temperature
0 °C (32 °F) min. / 30 °C (86 °F) max.
Relative Air Humidity
~ 80 % R.H. max.
Dew Point
Beware of condensation! The substrate and uncured floor must be at least 3 °C (5 ˚F) above dew point to reduce the risk of condensation or blooming on the floor finish.
Substrate Temperature
0 °C (32 °F) min. / 30 °C (86 °F) max.
Pot Life
| Temperature | Time |
| 0 °C (32 °F) | ~ 20 minutes |
| 10 °C (50 °F) | ~ 20 minutes |
| 20 °C (68 °F) | ~ 15 minutes |
| 30 °C (86 °F) | ~ 8 minutes |
Curing Time
Before overcoating Sikalastic®-518 Pronto allow:
| Temperature | Min. Time |
| 0 °C (32 °F) | ~ 50 minutes |
| 10 °C (50 °F) | ~ 50 minutes |
| 20 °C (68 °F) | ~ 40 minutes |
| 30 °C (86 °F) | ~ 30 minutes |
Applied Product Ready for Use
| Temperature | Foot Traffic | Full Cure |
| 0 °C (32 °F) | ~ 50 minutes | ~ 2 hours |
| 10 °C (50 °F) | ~ 50 minutes | ~ 2 hours |
| 20 °C (68 °F) | ~ 40 minutes | ~ 1 hour |
| 30 °C (86 °F) | ~ 30 minutes | ~ 1 hour |
Consumption
1.2 - 1.4 m²/L (50 - 57 ft2/ US gal.) at ~ 28 to 32 mil d.f.t./w.f.t. (0.7 mm) depending on the system applied.
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc. For detailed info, refer to the system data sheet Sikalastic® Pronto RB-5700 PUMA.
MIXING
Mix part A thoroughly to ensure uniform pigment dispersion, then add the Hardener in the correct quantity and mix for one (1) additional minute. Over mixing must be avoided to minimize air entrainment. For easy of handling, 18.9 L (5 US gal.) units may be split (refer to mixing table). Always measure out components.
Note: Factory-blended pigment may settle to bottom of pail over time. To optimize opacity of finished coat, inspect prior to addition of Sikafloor® Pronto Hardener. If unblended paste is discovered, use spatula or other tool to dislodge paste and mix to disperse in resin.
Mixing Tools:
Important: For indoor work, spark-free mixing equipment must be used (explosion-proof). Sikalastic®-518 Pronto Topcoat must be thoroughly mixed using a low speed electric stirrer (300 - 400 rpm) or other suitable equipment.
APPLICATION
Prior to application confirm r.h. and dew point. For exterior applications, apply while temperature is falling. If applied during rising temperatures “pin holing” may occur from rising air.
Seal Coat:
Immediately after mixing, pour the Sikalastic®-518 Pronto Topcoat onto the substrate and spread evenly by means of a lint-free, short-pile roller or squeegee and then back-rolled (crosswise) with a short-pile roller. A seamless finish can be achieved if a ‘wet’ edge is maintained during application.
CLEAN UP
Clean all tools and application equipment with Sika® Urethane Cleaner and Thinner immediately after use. Hardenedand/or cured material can only be removed mechanically.