What is Selleys Hold Up, and where should you use it?

Selleys Hold Up is a high-grab construction adhesive built to replace screws, nails and clamps — including on vertical surfaces. It uses Sil-X technology, works on most common building materials indoors and outdoors, and is heat, UV and water resistant.

The number that defines it is its vertical holding capacity: up to 240 kg/m² from the tube, or up to 360 kg/m² from the cartridge. That is what lets you stick something to a wall and walk away instead of propping it.

The condition attached to that capability is equally important, and it is where most Hold Up jobs go wrong: the adhesive must not be disturbed until cured, which takes at least 48 hours. High initial grab is not the same as a finished bond.

Technical specification

Property	Typical result
Appearance	Smooth white paste
Technology	Sil-X
Cure time	At least 48 hours
Skin time	Approx. 45 minutes
Adjustable	For up to 15 minutes
Vertical hold — tube	Up to 240 kg/m²
Vertical hold — cartridge	Up to 360 kg/m²
Paintable	After 48 hours, with water-based paints
Shelf life	12 months
Packaging	130 g tube and 290 mL cartridge, white / off-white

Indicative data only, not intended for the preparation of specifications. Note that the product page's summary bullet quotes the 360 kg/m² figure alone; the technical data sheet distinguishes 240 kg/m² for the tube from 360 kg/m² for the cartridge, and those are the figures used here.

What the key numbers mean in practice

The 15 minute adjustment window is the feature to plan your job around. Once the surfaces are together you can still move them for up to 15 minutes — enough to check a level, slide a panel into alignment, or reposition something that went on crooked. That is a genuinely generous window for a high-grab adhesive, and it means you should place the item roughly, then check and correct, rather than trying to get it perfect on first contact.

The 45 minute skin time closes that window for good. After roughly 45 minutes the surface has skinned and adjustment is over. Anything you have not aligned by then stays where it is.

The 48 hour cure is the figure people underestimate. The adhesive must not be disturbed until cured, and cure takes at least 48 hours. Between the 15 minute mark and the 48 hour mark the bond is developing but not finished — that is precisely the period when a knocked shelf or a hung towel rail pulls away. Plan the job so nothing touches it for two days.

The kg/m² figures are per square metre of bonded area, not per bead. That distinction matters. If you glue a small mirror with four short beads, you have not committed anywhere near a square metre of adhesive, and the load it will carry is proportionally smaller. This is why the instruction is to cover the full surface with vertical beads about 5 cm apart rather than putting a few dabs in the corners — the coverage is what buys the holding power.

Selleys' own precaution deserves following. For heavy objects, overhead applications, and non-porous materials such as glass and metals, it is recommended that additional supports — clamps, for example — are used during cure as a precaution. That is the manufacturer telling you that the "no clamps needed" claim has boundaries, and heavy, overhead or non-porous work sits outside them.

Where to use it

Hold Up is suitable for small jobs indoors or outdoors, and works on most materials:

• Timber
• Concrete and masonry
• MDF and particleboard
• Plasterboard
• Metals
• Glass
• Tiles and ceramics
• Some plastics — see the limitations below

How to apply it

Cartridge:

1. Make sure the surfaces are clean and free from grease, grit and grime. Sand back any loose or peeling surfaces.
2. Use a high quality caulking gun. Hold Up is a high performance product and a poor gun will not deliver it evenly.
3. Face the V cut-out part of the nozzle upwards and apply the adhesive to one surface in long vertical beads approximately 5 cm apart, covering the full surface.
4. Press the surfaces together firmly, making sure the adhesive spreads.

Tube:

1. Make sure the surfaces are clean and free from grease, grit and grime, and sand back any loose or peeling surfaces.
2. Pull off the cap, unscrew the nozzle and pierce the membrane with the tip of the nozzle. Replace the nozzle and cut along the second ridge.
3. Cover one surface with Hold Up in long vertical strips.
4. Press the surfaces together firmly, making sure the adhesive spreads.

Then, for either format: adjust within 15 minutes if needed, add temporary support for anything heavy, overhead or non-porous, and leave it undisturbed for at least 48 hours.

Applying the beads vertically is worth doing as instructed rather than in a serpentine pattern. Vertical beads let any moisture behind the item drain rather than pool, and they give the adhesive room to spread sideways when you press the surfaces together.

Limitations — where it should NOT be used

• Not for some plastics — polyethylene (PE), polypropylene (PP) or PTFE (Teflon). These are low-surface-energy plastics that this adhesive will not grip.
• Not for some rubbers.
• Not suitable for permanent water immersion. Water resistant covers weather and splashing; it does not cover a joint that lives underwater.
• Must not be disturbed until cured — at least 48 hours.
• Use additional supports as a precaution for heavy objects, overhead applications, and non-porous materials such as glass and metals.
• Surfaces must be clean, dry and free from oil, grease, grit and dust. Loose or peeling surfaces must be sanded back — bonding to a surface that is itself letting go achieves nothing.

Clean up, painting and storage

Clean up immediately with white spirits or turps, before the product cures. The 45 minute skin time is your real deadline here, and cured adhesive is far harder to deal with than a wipe at the time.

Hold Up is paintable after 48 hours with water-based paints. Both parts of that matter — the 48 hours, and the water-based qualifier.

Store in a cool dry place below 30°C. Shelf life is 12 months.

Hazard classification

Classified as hazardous under Safe Work Australia GHS 7, with the signal word Warning.

• Sensitisation, skin — Category 1. H317: may cause an allergic skin reaction.
• Eye damage/irritation — Category 2A. H319: causes serious eye irritation.

Hold Up is not classified as Dangerous Goods under the Australian Code for the Transport of Dangerous Goods by Road & Rail or New Zealand NZS5433. It carries no flammability classification.

What is in it

Chemical entity	CAS number	Proportion (w/w)
Trimethoxyvinylsilane	2768-02-7	1–10%
Calcium oxide	1305-78-8	<1%
Decanedioic acid, bis(2,2,6,6-tetramethyl-4-piperidinyl) ester	52829-07-9	<1%
Hydroxyphenylbenzotriazole derivative	104810-47-1	<1%
Silicic acid (H4SiO4), tetraethyl ester, reaction products with bis(acetyloxy)dioctylstannane	93925-43-0	<1%
N-[3-(Trimethoxysilyl)propyl]ethylenediamine	1760-24-3	<1%
Non-hazardous or below reporting limits	—	Balance

Read that list against the classification and the picture is consistent: no solvent, no flammability, and everything declared sits at 10% or below. The safety data sheet does not say what each ingredient does, but the entries map onto the product's claims in a way that is worth noting as inference rather than fact: the methoxysilanes are the class that reacts with atmospheric moisture to build a bond, and the hindered amine and benzotriazole derivatives belong to the class used as light stabilisers, which is the kind of additive a UV resistance claim normally rests on.

H317 is the classification that deserves attention on a product like this, because of how the product is used rather than how hazardous it is per squeeze. Skin sensitisation is not irritation. It is the immune system learning to react, it is generally permanent once acquired, and thereafter much smaller exposures trigger it. It develops from repeated low-level contact, not from one big dose — which is exactly what pressing a panel home, wiping the nozzle, and running a bare finger along squeeze-out looks like when you do it several times a day. Gloves on a job that feels too small to bother with are the specific control for this hazard.

Where the sensitising component sits is not identified in the safety data sheet, but the aminosilane and the organotin reaction product are the two entries whose chemical classes are commonly associated with skin sensitisation in cured-silicone and silane systems. Treat that as inference from the composition rather than a sourced attribution. The same organotin entry — bis(acetyloxy)dioctylstannane, incorporated into the silicic acid reaction product at under 1% — belongs to a class that also attracts reproductive toxicity classifications at higher concentrations; at this level no such classification is assigned to the product.

One practical link to the directions above: clean-up is with white spirits or turps inside the 45 minute skin time. That puts a solvent on your hands at the same moment as the uncured adhesive, and solvent on skin is what carries a sensitiser past the skin barrier. Glove for the wipe-down as well as for the application.

Protection

• Gloves — nitrile rubber is indicated for intermittent contact; make your own final assessment for your conditions and glove construction. This is the primary control for the sensitisation hazard.
• Eye protection — safety glasses, particularly for overhead and vertical work where squeeze-out can drop.
• Clothing — overalls and safety shoes. Wash contaminated clothing and protective equipment before storing or reusing.
• Ventilation — adequate general ventilation; local exhaust or an organic vapour and particulate respirator to AS/NZS 1715 and AS/NZS 1716 where an inhalation risk remains.
• Wash hands before eating, drinking, smoking or using the toilet.

First aid

Exposure	What to do
Eyes	Hold the eyelids apart and flush continuously with running water — until told to stop by the Poisons Information Centre or a doctor, or for at least 15 minutes — then go to a doctor or hospital.
Skin	Remove contaminated clothing immediately and flush skin and hair with running water, continuing until told to stop or for at least 15 minutes. For gross contamination, drench with water and remove all clothing. Cover any burn with a clean dry dressing; do NOT break blisters. Seek medical assistance if swelling, redness, blistering or irritation develops.
Inhalation	Move the person to fresh air without becoming a casualty yourself. Loosen tight clothing, let them rest comfortably and keep them warm until fully recovered. Seek medical advice if effects persist.
Swallowed	Rinse the mouth with water. Do NOT induce vomiting. Give a glass of water. Never give anything by mouth to an unconscious person. Seek medical advice.

If poisoning occurs, contact a doctor or the Poisons Information Centre — 131 126 in Australia, 0800 764 766 in New Zealand — with the container to hand. Selleys emergency line: 1800 220 770 in Australia, 0800 220 770 in New Zealand.

Common questions about Selleys Hold Up

How much weight will it hold on a wall?

Up to 240 kg/m² from the tube and up to 360 kg/m² from the cartridge, on vertical surfaces such as walls. Those figures are per square metre of bonded area, so full coverage matters.

How long until it is fully cured?

At least 48 hours, and it must not be disturbed in that time.

Can I reposition something after sticking it?

Yes, for up to 15 minutes. After the roughly 45 minute skin time, adjustment is no longer possible.

Do I really not need clamps or nails?

For most small jobs, no. But Selleys recommends additional supports such as clamps during cure for heavy objects, overhead applications, and non-porous materials such as glass and metals.

Can I use it outside?

Yes. It is suitable for interior and exterior projects and is heat, UV and water resistant — though not for permanent water immersion.

Can I paint over it?

Yes, after 48 hours, using water-based paints.

Will it stick to plastic?

To some plastics, but not to polyethylene, polypropylene or PTFE (Teflon), and not to some rubbers.

How should I lay the beads?

In long vertical beads about 5 cm apart, covering the full surface, then press firmly so the adhesive spreads.

What sizes does it come in?

A 130 g tube and a 290 mL cartridge, in white / off-white.

How do I clean it up?

Immediately, with white spirits or turps, before the product cures.

What preparation do the surfaces need?

Clean, dry, and free from grease, grit and grime. Sand back any loose or peeling surfaces first.

How long does an unopened pack last?

Shelf life is 12 months. Store below 30°C in a cool dry place.

What else could I use for a construction job?

For larger or heavier building work, look at the Liquid Nails range — Liquid Nails Heavy Duty for most building materials, or Liquid Nails Exterior for all-weather outdoor bonding.