vulkem 350/351 application instructions

2․3 Priming Requirements

Priming is essential for ensuring proper adhesion of Vulkem 350/351 to the substrate․ Apply a compatible primer to clean, dry surfaces, following manufacturer guidelines․ For concrete surfaces, use Tremco’s recommended primers to enhance bonding and prevent pinholes․ On metal surfaces, a rust-inhibitive primer is necessary to protect against corrosion and ensure a strong bond․ Primers must be fully cured before applying the base coat․ Avoid applying primer in direct sunlight or high humidity, as this can affect curing․ Proper priming ensures the Vulkem system adheres uniformly, providing a durable, watertight seal․ Always refer to Tremco’s application instructions for specific primer recommendations tailored to your substrate and environmental conditions․

2․4 Weather Conditions for Application

The application of Vulkem 350/351 should be conducted under favorable weather conditions to ensure optimal results․ Ideal temperatures range between 40°F (4°C) and 90°F (32°C), with relative humidity below 80%․ Avoid applying the material in direct sunlight or high humidity, as this can lead to uneven curing․ Surfaces must be completely dry and free of moisture before application․ If rain is expected within 24 hours, postpone the application to prevent wash-off or improper curing․ Ensure the substrate is cool to the touch and not exposed to standing water․ Adhering to these weather guidelines is critical to achieve a strong, durable membrane․ Always monitor weather conditions before and during application to maintain the integrity of the Vulkem system․

Application Process

The application process involves surface preparation, mixing, and applying base and top coats․ Broadcasting aggregate enhances traction․ This system ensures durability and protection․

3․1 Materials Needed for Application

The application of Vulkem 350/351 requires specific materials to ensure proper installation․ These include Vulkem 350NF-SL base coat, Vulkem 351 top coat, and silica sand or aluminum oxide for texture․ Tools such as medium-nap rollers, notched squeegees, and brushes are essential for applying the coatings․ A mixer is needed for blending the materials, and safety equipment like gloves and goggles should always be used․ Additionally, weather conditions must be considered, avoiding rain or high humidity․ Proper ventilation is crucial during application to prevent fume buildup․ All materials should be stored according to manufacturer guidelines to maintain their effectiveness․ Ensuring the right materials are on hand helps achieve a smooth, durable, and long-lasting waterproofing system․ Proper preparation and material selection are critical for a successful application․

3․2 Mixing Instructions

Before application, ensure all materials are properly mixed according to the manufacturer’s guidelines․ For Vulkem 350NF-SL base coat, mix thoroughly using a mechanical mixer until a uniform consistency is achieved․ Apply the base coat with a notched squeegee or airless sprayer, followed by back-rolling to ensure even coverage․ For Vulkem 351 top coat, mix well in a clean bucket to maintain its single-component polyurethane properties․ Apply the top coat using a medium-nap, solvent-resistant roller sleeve at a rate of 105 ft² per gallon to achieve 15 wet mils thickness․ Avoid over-mixing, as it may introduce air bubbles․ Always check the weather conditions before mixing, as high humidity or rain can affect adhesion and curing․ Proper mixing ensures the coating adheres correctly and cures to form a durable, waterproof membrane․ Follow all safety precautions, including wearing protective gear during the mixing process․

3․3 Base Coat Application

The base coat, typically Vulkem 350NF-SL, should be applied to the entire surface, including detail areas like cracks and joints, using a notched squeegee or airless sprayer․ Ensure the coat covers all areas evenly, feathering edges where necessary․ Apply at a rate of 40-64 square feet per gallon to achieve a wet thickness of 25-40 mils (0․6-1 mm)․ Avoid ponding or excess material by using a screen in the pail․ Back-roll immediately after spraying or squeegeeing to ensure proper adhesion and smoothness․ Allow the base coat to cure according to the manufacturer’s instructions before proceeding to the top coat․ Proper application ensures a strong bond and a uniform foundation for the waterproofing system․

3․4 Top Coat Application

The top coat, typically Vulkem 351, is applied using a medium-nap, solvent-resistant roller sleeve․ Apply at a rate of 105 square feet per gallon to achieve approximately 15 wet mils thickness․ Use a screen in the pail to remove excess material, preventing puddles․ Work in sections that allow easy back-rolling after application․ Immediately after applying, broadcast 30 to 40 mesh silica sand or aluminum oxide into the wet top coat for texture, then back-roll to distribute evenly․ This step ensures a slip-resistant finish․ If no aggregate is required, simply back-roll the wet coat for a smooth surface․ Allow the top coat to cure as per manufacturer guidelines before exposing it to foot traffic or weather conditions․ Proper application ensures a durable, UV-stable finish that protects the substrate effectively․

3․5 Broadcasting Aggregate

For a slip-resistant finish, broadcast 30 to 40 mesh silica sand or aluminum oxide into the wet Vulkem 351 top coat immediately after application․ Apply the aggregate at a rate of 15 to 18 pounds per gallon, ensuring even distribution․ Use a medium-nap roller to back-roll the surface, embedding the aggregate uniformly․ Avoid over-saturating the material with excess aggregate, as this can compromise adhesion․ The aggregate should be evenly distributed to achieve the desired texture and slip resistance․ This step is critical for pedestrian areas requiring traction․ Ensure the surface is fully covered but not overloaded with material․ Allow the top coat to cure completely before exposing it to traffic or weather conditions․ Proper aggregate application enhances durability and safety of the waterproofing system․

Drying and Curing

Vulkem 350/351 dries quickly, typically within 2-4 hours depending on ambient conditions․ Full cure is achieved in 24 hours․ Ensure proper ventilation and avoid moisture during curing․

4․1 Drying Time

The drying time for Vulkem 350/351 depends on environmental conditions․ Typically, it dries to the touch within 2-4 hours at 75°F (24°C) and 50% humidity․ Full cure is achieved in 24 hours․ Factors such as temperature, humidity, and ventilation can influence drying rates․ Lower temperatures or high humidity may delay drying, while warmer conditions accelerate it․ It is crucial to ensure the surface remains dry and free from contamination during this period․ Proper ventilation is essential to facilitate even drying and prevent the formation of blisters or uneven surfaces․ Always follow the manufacturer’s recommendations and avoid applying additional coats or exposing the surface to foot traffic until the specified drying time has elapsed․ Monitoring jobsite conditions is key to achieving optimal results․

4․2 Curing Process

The curing process for Vulkem 350/351 ensures the formation of a durable, rubber-like membrane․ After application, the material begins to cure through a chemical reaction, reaching full strength within 24 hours under ideal conditions․ The base coat (Vulkem 350) typically cures faster than the top coat (Vulkem 351), which may require additional time to achieve its full UV-resistant properties․ Environmental factors, such as temperature and humidity, significantly influence the curing rate․ For optimal results, the surface should remain dry and free from contamination during the curing period․ It is recommended to avoid exposing the coated surface to heavy foot traffic or water until the curing process is complete․ Proper curing ensures the system’s long-term performance and waterproofing integrity․ Always adhere to the manufacturer’s guidelines for specific curing timelines and conditions․