Dr. Fixit Feviseal HY 200
A primerless, isocyanate-free hybrid PU sealant engineered for ±25% joint movement — from tile grout lines to waterproofing terminations.
What is it?
A one-component, moisture-curing hybrid polyurethane sealant (ASTM C920 Type S, Grade NS, Class 25 NT) that combines PU toughness with silicone-like flexibility in a low-modulus, gun-grade formula.
Where is it used?
Control and expansion joints, non-moving concrete crack repair, tile/marble/brick joints, window and door frame perimeters, skirtings, parapets, balconies, curtain-wall framing, and as a termination bead at the edges of waterproofing systems.
Why use it?
Handles ±25% joint movement, resists UV and dirt pickup over 300 hours of accelerated testing, needs no primer on most substrates, and can be overpainted — a low-drama seal for sites with big daily thermal swings.
How is it applied?
Gunned from a 600 ml sausage pack into a properly backer-rodded joint sized to a 2:1 (or 1:1 for narrow joints) width:depth ratio, then tooled smooth within the roughly 30-minute skin time before the masking tape comes off.
About Dr. Fixit Feviseal HY 200
Feviseal HY 200 is Pidilite’s entry into the hybrid-polymer sealant category under the Dr. Fixit umbrella — a one-component, moisture-curing polyurethane sealant re-engineered to behave more like a modified-silicone product on site. Conventional PU sealants lean on isocyanate chemistry that many site crews find harsh to work with in closed rooms; Feviseal HY 200 is formulated isocyanate- and solvent-free, so it cures odourlessly off atmospheric moisture into a low-modulus rubber that flexes with the joint instead of fighting it. It carries an ASTM C920 Type S, Grade NS, Class 25 NT rating — the performance class typically used to specify general-purpose PU and hybrid building sealants — and ships as a 600 ml sausage sized for a standard barrel gun, not a small cartridge gun, which is worth factoring into tooling costs for a site crew.
On an Indian construction site, what a sealant actually has to survive isn’t exotic: RCC shrinkage cracks, tile joints that see direct monsoon wetting, and window frames set into masonry that swells and shrinks through Delhi’s 45°C summers and near-freezing January nights. Feviseal HY 200’s ±25% movement capability, non-sag body and largely primerless application are built around exactly that — control joints, brick and tile grout lines, parapet upstands, and, usefully for waterproofing crews, the termination bead where a membrane or coating system closes off against a wall or drain. As an authorised Dr. Fixit distributor and applicator, Space Arc Engineering stocks Feviseal HY 200 alongside the rest of the Dr. Fixit repair and waterproofing range, so a contractor can source the sealant and whatever membrane or coating it’s terminating against from the same counter.
The technical insight
The number worth paying attention to on this data sheet is the ±25% movement capability under ASTM C719, which is what earns Feviseal HY 200 its “Class 25 NT” tag inside the ASTM C920 rating — NT means non-traffic, so it’s specified for building joints, not trafficked pavement joints (that’s a job for a two-part polysulfide). Paired with a low Shore A hardness of 30±5, the cured sealant stays soft enough to absorb thermal cycling without debonding at the joint face, which is usually where cheaper acrylic sealants fail first. The joint-design rule printed on the data sheet — 1:1 width:depth for 6-12 mm joints, 2:1 for 12-25 mm joints — isn’t boilerplate: undersizing the backer rod so the sealant bonds to the joint base as well as its walls is one of the most common site errors that causes premature tearing, on this product or any competing sealant.
Where it is used
- Control and expansion joints in RCC-framed structures
- Repair and sealing of non-moving concrete cracks
- Joints between tiles, marble, granite and brick
- Window and door frame perimeter sealing
- Skirting joints at floor-to-wall junctions
- Parapet and balcony joints
- Curtain-wall framing perimeter joints (not structural glass-to-frame glazing)
- Termination bead at the edges of waterproofing membranes and coatings
Key advantages
- Isocyanate- and solvent-free formulation — odourless and easier to gun safely in closed rooms
- Primerless adhesion on most building substrates, cutting a prep step off the joint schedule
- ±25% movement capability (ASTM C719), carrying the Class 25 NT tag under ASTM C920
- Non-sag consistency that holds its shape in vertical and overhead joints without slumping
- Damp-surface tolerant, useful when a joint can’t wait for a fully dry spell in the monsoon season
- Low dirt pickup and no measurable deterioration after 300 hours of accelerated UV exposure
- Can be overpainted to match the surrounding wall or frame once compatibility is confirmed
- Very low VOC (under 5 g/l by USEPA-24), a genuine plus on occupied-building retrofit jobs
Limitations & considerations
- Not for continuous immersion — chlorinated pool/spa water or constant salt-water contact will degrade it
- Excluded from structural glazing applications, despite being listed for curtain-wall joint use
- Won’t bond to PE, PP, Teflon, neoprene or bituminous surfaces
- Not recommended for natural stone joints because of staining risk
- Ships in a single colour (grey) ex-factory, so exposed joints on light facades need overpainting to match
- Paint compatibility, especially with alkyd systems, needs to be site-tested before full-scale overcoating
Selection & best practice
Size the joint before you buy the sealant, not after: set a closed-cell backer rod to give a 1:1 width:depth ratio on 6-12 mm joints and 2:1 on 12-25 mm joints, because the sealant needs to move as a thin membrane rather than a solid plug. Clean both joint faces with xylene to strip laitance, curing compound and dust, mask both edges for a clean line, and gun the sealant in one continuous pass ensuring full contact with both walls before tooling it smooth inside the roughly 30-minute skin-over window — pull the masking tape immediately after tooling, not after it has skinned over. On joints that sit in standing water even occasionally, such as drain channels or sunken slabs, use Dr. Fixit Pidiprime A first: that’s the one situation where the data sheet’s “generally primerless” claim doesn’t hold, and skipping it is the most common cause of early adhesive failure on this product.
Specifications
| Chemistry / System | One-component, moisture-curing hybrid polyurethane sealant, isocyanate- and solvent-free |
| Standard Compliance | ASTM C920 Type S, Grade NS, Class 25 NT |
| Colour | Grey |
| Specific Gravity | 1.25 ± 0.05 |
| Movement Capability | ±25% (ASTM C719) |
| Tensile Strength | > 0.8 MPa (ASTM D412-98a) |
| Elongation at Break | > 200% (ASTM D412-98a) |
| Hardness (Shore A) | 30 ± 5 (ASTM D2240-97) |
| Pack Size / Coverage | 600 ml sausage; ~24 lm on a 5×5 mm joint or ~6 lm on a 10×10 mm joint |
Industry use cases
Residential apartments & villas (Delhi NCR)
Sealing tile-to-tile and tile-to-wall joints in kitchens, balconies and terraces, where daily temperature swings of 15-20°C put movement joints under real, repeated stress.
RCC-framed commercial buildings
Filling control and expansion joints across slabs and façade panel junctions, sized to the 1:1/2:1 width:depth rule so the sealant absorbs structural movement rather than tearing.
Waterproofing contractors
Used as the termination bead where a torch-applied membrane, PU coating or Dr. Fixit waterproofing system meets a parapet, drain or upstand, closing the edge against capillary water ingress.
Window & door fabricators / retrofit teams
Perimeter sealing of aluminium and UPVC frames against masonry, where primerless adhesion and paintability keep the finish consistent with the surrounding wall.
Facade & curtain-wall installers
Sealing the framing perimeter joints around curtain-wall members — not the structural glass-to-frame glazing bite, which needs a dedicated structural-glazing sealant instead.
Frequently asked questions
Does Feviseal HY 200 need a primer before application?
Can I use it to seal a joint in a water tank or swimming pool?
How much sealant do I actually need for my joints?
Can Feviseal HY 200 be painted over once it’s cured?
What’s the shelf life, and how should it be stored on site?
Is it suitable for sealing natural stone cladding joints?
How we position Dr. Fixit Feviseal HY 200
Within Space Arc’s Dr. Fixit catalogue, Feviseal HY 200 is the joint-sealing counterpart to the crack-repair and waterproofing products it’s typically installed alongside — pair it with Crack X Paste for substrate crack repair ahead of sealing, or with Aquashield PU and Pidicrete URP where the sealant is closing off the edge of a coated waterproofing system. It is currently the only Feviseal-branded sealant in Space Arc’s catalogue, so it stands in for the brand’s wider sealant range referenced on Dr. Fixit’s own data sheet. It is not a substitute for a structural-glazing or continuous-immersion sealant: where a joint sits permanently or intermittently underwater — overhead tanks, STPs, swimming pools — Fosroc’s Nitoseal MS600 is the more defensible specification, carrying WRAS potable-water approval that Feviseal HY 200 doesn’t claim. For high-movement trafficked or fuel-exposed joints, a two-part polysulfide such as Fosroc Thioflex 600 remains the better-suited alternative.
Fosroc Nitoseal MS600 — A specifier should switch to Nitoseal MS600 when the joint sits in permanent or intermittent water contact — potable water tanks, STPs, swimming pools — since it carries WRAS approval and immersion performance that Feviseal HY 200’s own data sheet explicitly excludes.
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