Cromar HydroSil Seam Sealer & Detailer is a professional grade, high performing seam sealer & detailer for the protection of seams, penetrations, and fasteners on various architectural surfaces and roofing substrates. Upon cure, it forms a durable, breathable and water‐resistant barrier that is resistant to degradation from UV and natural weathering.
Hydrosil is a highly reflective Fluid Applied Professional Grade Silicone Coating System used to coat all existing roofing substrates.
System includes:
HYDROSIL PROFESSIONAL LIQUID SILICONE ROOF COATING is a professional grade 100% Silicone roof coating. This product is a high performance, solvent based, high solids, single component, moisture cure liquid applied silicone coating. HYDROSIL Professional liquid silicone is an elastomeric yet vapour permeable membrane exhibiting outstanding weathering and water resistance for application to most common roofing substrates.
HYDROSIL SEAM SEALER & DETAILER is a premium silicone multi-purpose mastic for detailing work & to cover all joints/seams prior to the application of Hydrosil (suitable for all roofing substrates). Upon cure, Seam Sealer & Detailer forms a durable, breathable and weatherproof barrier that is highly resistant to degradation from UV and natural weathering.
HYDROSIL HEAVY DUTY REINFORCEMENT ROLL is non-woven, spun bonded 100% polyester and used with HYDROSIL SEAM SEALER & DETAILER to reinforce seams, penetrations, joints or transitions that are subjected to high shear.
Cromar HydroSil Seam Sealer & Detailer is a professional grade high performing seam sealer & detailer for the protection of seams, penetrations, and fasteners on various architectural surfaces and roofing substrates. Upon cure, it forms a durable, breathable and water‐resistant barrier that is resistant to degradation from UV and natural weathering.
Note: For professional use only – do not dilute. We cannot assume liability for the results of customers use or a customer’s inability to properly use or apply this product.
Suitable for use on most common roofing substrates
Excellent Adhesion
High solids content
Touch dry in 6 hours
Can be used in conjunction with the Hydrosil Reinforcement Roll for the repair of blisters/splits and roofing felt repairs
Low VOC <50g/l
For professional use only
Typical Properties
Technical Data
Cromar HydroSil Seam Sealer & Detailer
Tensile Strength
305 ± 10 psi @ 23°C
Elongation
60% ± 10% @ 23°C
Tear Resistance
25 ± 5 lbf/in @ 23°C
V.O.C
<50 g/l
Solids by Weight
97% ± 2
Solids by Volume
91% ± 2
Tack Free Cure
2 hours*
Dry To Touch
6 hours*
*Drying time is dependent on temperature, humidity and film thickness.
Please consult our Technical Department on 0113 2455450 (option 2) or send a message to [email protected] for specific advice.
Surface Preparation
Preparation of the roof substrate is the responsibility of the installer
Examine substrates to receive new roofing
Do not proceed with the installation of the Coating System until unsatisfactory conditions have been corrected
All areas that are to be coated or repaired must be clean, dry and free of dust, dirt, grease, wax, or other incompatible substances to promote satisfactory adhesion
It may be necessary to power wash and/or prime to enhance adhesion
Can be applied by trowel or stiff brush
Product should be applied as received and dilution with solvent is not recommended
If settling in the package has occurred, stir or shake the material well prior to use
Can be applied over surfaces that exhibit ponding water, however it is advised that all roof systems be designed and built to ensure positive drainage
All flashing details, penetrations and curbs shall be covered with HydroSil Seam Sealer and Detailer at 3‐4mm thick and shall be feathered at the edges for the water to flow over the various flashing details
Blisters/Splits:
Large splits/blisters are required to be repaired, use HydroSil Heavy Duty Reinforcement roll fabric with HydroSil Seam Sealer and Detailer Seam Sealer at 1.5 ‐ 2mm thick in a three‐course fashion and spread to 5cm to 10cm beyond the splits/blisters areas
Roofing Felt Repair:
Thoroughly inspect the roof substrates for defects (holes and openings)
For repairs over 3mm wide, use HydroSil Heavy Duty Reinforcement roll fabric with HydroSil Seam Sealer and Detailer Seam Sealer at 1.5cm thick in a three‐course fashion and spread to 5cm to 10cm beyond the repaired areas
Roof Drains:
Remove clamping ring and clean all existing build‐up from around the drains and sumps
Apply HydroSil Seam Sealer and Detailer across the entire drain/sump area
Extend the application into the drain bowl from centre of drain onto the deck 15cm beyond drain sump
Allow to cure
Replace clamping ring
The silicone coat application shall be applied over the HydroSil Seam Sealer and Detailer
Curb Flashings:
All curb flashings shall be dressed in at least a 5cm wide x 3‐4 mm thick HydroSil Seam Sealer and Detailer
Fasteners:
Encapsulate all fasteners using HydroSil Seam Sealer and ensuring a water-tight seal from the base to the top of the fastener
Penetrations:
HydroSil Seam Sealer and Detailer shall be applied around the base of the penetration, extending at least 10cm onto the vertical and 10cm onto the base
Use additional HydroSil Seam Sealer and Detailer as necessary to accommodate the shape of the penetration
Seams:
All seams and areas around roof protrusions (vents, scuttle hatches, etc.) are to be treated with HydroSil Seam Sealer and Detailer at 3‐4cm thick to achieve a water-tight reinforced seal
Pitch Pans:
Pitch pans shall be covered using HydroSil Seam Sealer and Detailer
Curbed AC Units:
All curb flashings shall be covered with at least a 5cm wide x 3‐4mm of HydroSil Seam Sealer and Detailer
The perimeter shall be flashed with HydroSil Seam Sealer and Detailer
Skylights:
All exposed skylight fasteners shall be covered with HydroSil Seam Sealer and Detailer
All curbed corner joints shall be covered with HydroSil Seam Sealer and Detailer at least 5cm wide x 3‐4mm thick
NOTES:
Inspect Preliminary Work / Flashing Details for problem areas (e.g., gaps, cracks, fish mouths, air pockets, etc.) before proceeding to the application of HydroSil Seam Sealer and Detailer. See Hydrosil Application Guide for further details.
To ensure a uniform build and thorough coverage it should typically be applied in one application
If applying in multiple applications, allow adequate time between each application for curing before applying additional material
Final cured thicknesses must be free of voids, pinholes, cracks or blisters
Cleaning
Clean equipment containing uncured material with mineral spirits, toluene, or alcohol based solvents
DO NOT USE water
Curing
Tack Free in 2 hours
Dry to Touch in 6 hours
Drying time is dependent on temperature, humidity and film thickness
Limitations
Do not apply at ambient temperatures lower than 4°C
Ensure that all surfaces are not wet or damp and that rain is not imminent during the application time, or for at least an hour after application
Should not be applied to unprepared surfaces including but not limited to those that are wet, dusty, oily, mildewed, heavily chalked, blistered or otherwise structurally unsound
Asphaltic or bituminous substrates may cause discoloration or bleeding of the mastic
Requires atmospheric moisture for propagation of cure thus it is not suitable for use in totally confined spaces
It is the user’s responsibility to ensure suitability for use
Read product label and application guide thoroughly before use
For specific advice regarding any aspect of this product, please consult our Technical Department on 0113 2455450 (option 2) or send a message to [email protected]
Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.
Due to this product being a sealer that can be used for more than one application at different thicknesses, the manufacturer does not list a coverage rate.
Cromar HydroSil Seam Sealer & Detailer is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
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