What is Selleys Spakfilla Wall Repair Kit, and where should you use it?

The Spakfilla Wall Repair Kit is an all-in-one kit for patching and repairing holes and cracks in interior walls up to 8cm wide. Rather than selling you a filler and leaving you to source the rest, the kit contains a self-adhesive wall patch, a sanding block, a spatula and a 100g tub of Spakfilla Rapid.

The one thing to understand before you buy it is what the patch is actually for. The patch is only needed for deeper and larger holes. For cracks or dents less than 25mm wide, you can use the Spakfilla Rapid filler on its own — the kit is the right purchase when you have a hole with nothing behind it to hold the filler, not when you have a hairline crack.

Technical specification

Property	Typical result
Kit contents	Self-adhesive wall patch, sanding block, spatula, 100g tub of Spakfilla Rapid
Maximum repair size	Holes and cracks in interior walls up to 8cm wide
Filler technology (Spakfilla Rapid)	Water based
Appearance	Smooth paste
Colour	White
Sand/paint time — less than 2mm	30 minutes
Sand/paint time — more than 2mm	24 hours
Before oil-based paints	Allow 24 hours
Minimum application temperature	Do not use below 5°C

These are indicative data from the product's technical data sheets, not intended for the preparation of specifications.

What the drying times actually mean for your repair

The headline figure is 30 minutes, and it is genuine — but it applies to thin applications. The technical data sheet for Spakfilla Rapid splits the sand and paint time in two: less than 2mm deep, 30 minutes; more than 2mm deep, 24 hours. A repair over a patch is by definition a generous application spread past the edges of the patch, so plan for the longer end of that range rather than the headline.

Two other things stretch it further. Cold or humid conditions extend the drying time, and oil-based paints need 24 hours regardless of how thin the fill is. If you are painting the same day, water-based paint over a thin skim is the only combination that reliably fits.

The 25mm threshold is worth reading the other way as well. Below it, the filler holds itself in the hole and the patch adds nothing. Above it, the filler has no backing and will sag or fall through, which is what the self-adhesive patch is there to prevent — it gives the filler something to bridge across.

Where to use it

The kit is intended for interior walls. Spakfilla Rapid, the filler supplied in it, is described as ideal for filling:

• Wallboard
• Wood
• Masonry
• Plaster
• Primed nail heads
• Plasterboard

Typical jobs are the ones that leave a hole with nothing behind it: a doorknob punched through plasterboard, a removed wall fixture, or a crack that has opened wider than a filler alone will hold. If your job is a small dent or a narrow crack instead, the filler on its own is enough. Other options in the wall filler range cover interior and exterior work of different kinds.

How to apply it

Surfaces must be clean and dry. The surface must also be free of loose or protruding material — sand it lightly first if necessary.

1. Sand any rough edges around the hole and use a dry cloth to wipe the surface clean. Filler will not adhere reliably over dust or loose paper.
2. Remove the backing and position the self-adhesive patch over the hole, with a 3mm minimum overlap all the way around. Press the edges down firmly. The overlap is what gives the patch something solid to stick to; a patch that only just spans the hole has nothing anchoring it.
3. Use the spatula to apply a generous amount of Spakfilla to fully cover the patch, extending past its edges. Feathering the filler out past the patch is what makes the repair disappear once painted — a fill that stops at the patch edge leaves a visible square.
4. Once dry, lightly sand the area smooth and wipe away any dust. Check the tub for the dry time that applies to your depth.
5. Paint over, if required.

If you are using the filler on its own for a crack or dent under 25mm, press it firmly into the hole with the spatula and smooth it off. Spakfilla Rapid exhibits virtually no shrinking, so there is no need to overfill — a habit worth unlearning if you are used to fillers that sink as they dry.

Limitations — where this kit should not be used

These are the manufacturer's stated limits, and they define what the repair can carry:

• Avoid using below 5°C or in wet conditions.
• Do not use on plastic, metal, or exterior timber likely to swell or shrink on absorption of water.
• Do not nail into it. Not for load bearing applications. A patched hole is a cosmetic repair, not a fixing point.
• Do not use where load or compression occurs, as the product may be crushed — for example behind a door where the knob touches against the wall.
• Where movement occurs, use Selleys No More Gaps instead. Filler is rigid; a joint that flexes needs a flexible gap filler.

That fourth point deserves attention, because the doorknob hole is one of the most common reasons people buy a wall repair kit in the first place. Filling the hole restores the surface, but it does not stop the knob hitting the wall again. Fit a door stop as part of the job or you will be repairing the same spot.

Clean up and storage

Clean up with water before the filler sets. Uncured product comes off with water; cured product has to be removed by scraping or sanding, so it is worth wiping the spatula and any smears while they are still soft.

Keep the container closed when not in use. If the filler has stiffened before you get to it, stir it. Product that has hardened should be discarded, but if it is merely too dry, add one teaspoon of water and stir again to the consistency you want.

Before painting, clean dust and loose filler particles off using Selleys Sugar Soap or Selleys Super Kleen. Some paints may temporarily discolour when applied over the filler, but they revert to the correct colour once dry — do not repaint in a panic.

Hazard classification

The kit itself is a box of parts, and only one of them raises a chemical question: the 100g tub of Spakfilla Rapid supplied in it. That filler is 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 irritation — Category 2A. H319: causes serious eye irritation.

It is not classified as Dangerous Goods for transport by road or rail in Australia, or under New Zealand NZS5433.

What is in it

Chemical entity	CAS number	Proportion (w/w)
Alcohols, C12–C14, ethoxylated, sulfates, sodium salts	68891-38-3	1–10%
1,2-Benzisothiazol-3(2H)-one (BIT)	2634-33-5	<0.05%
5-Chloro-2-methyl-4-isothiazolin-3-one (CMIT)	26172-55-4	<0.05%
2-Methyl-2H-isothiazol-3-one (MIT)	2682-20-4	<0.05%
Ingredients determined to be non-hazardous or below reporting limits	—	Balance

The numbers are worth reading properly, because they look reassuring and are not the whole story. The three isothiazolinones are each present at under 0.05% — less than one part in two thousand. They are in there as preservatives, which is what a water-based product in a tub needs so that it survives on a shelf. Isothiazolinones as a chemical class are the component group most commonly associated with skin-sensitisation classifications in water-based fillers and paints, and that is the most likely reason this filler carries H317 despite containing nothing else of note; the safety data sheet does not attribute the classification to a specific ingredient, so treat that as the chemically obvious reading rather than a sourced fact.

Sensitisation is a different thing from irritation, and the difference matters more than the percentage does. An irritant hurts while it is on you and stops when you wash it off. A sensitiser can teach your immune system to react to it — and once that has happened it is generally permanent, and thereafter far smaller exposures set it off. It develops from repeated casual contact rather than from one bad splash. Smoothing filler with a bare fingertip because the tub is right there and the job is small is precisely the pattern that builds it up.

That is an odd hazard to find in a kit sold for one afternoon's work, and for a single patch it is a low concern. It is worth knowing anyway, because the person who buys this kit for a picture-hook hole is often the same person who later buys the 500g tub.

Protection

• Eye protection — safety glasses, especially when working above head height.
• Gloves — nitrile rubber is suitable for intermittent contact. Use them rather than a fingertip for tooling the filler.
• Ventilation — natural ventilation is adequate under normal use conditions.
• Sanding — the kit includes a sanding block, and sanding any set filler produces respirable dust. Wear a dust mask and eye protection.
• Wash hands before eating, drinking or smoking, and wash contaminated clothing before wearing it again.

First aid

Exposure	What to do
Eyes	Wash out immediately with water. Seek medical advice in all cases of eye contamination, as a precaution.
Skin	Remove contaminated clothing and flush skin and hair with running water. If swelling, redness, blistering or irritation occurs, seek medical assistance.
Inhalation	Move to fresh air, loosen tight clothing, keep at rest and warm. 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 the Spakfilla Wall Repair Kit

What comes in the kit?

A self-adhesive wall patch, a sanding block, a spatula, and a 100g tub of Spakfilla Rapid.

How big a hole can it repair?

Holes and cracks in interior walls up to 8cm wide.

Do I always need the patch?

No. For cracks or dents less than 25mm wide you can use the Spakfilla Rapid filler on its own. The patch is only needed for deeper and larger holes.

How long before I can paint it?

30 minutes for thin applications. For applications more than 2mm deep, or in cold or humid conditions, expect longer — the filler's own data sheet gives 24 hours for fills over 2mm. For oil-based paints, allow 24 hours in any case.

Do I need to overfill to allow for shrinkage?

No. Spakfilla Rapid exhibits virtually no shrinking, so there is no need to overfill.

Can I use it outside?

The kit is for interior walls. Do not use it on exterior timber likely to swell or shrink on absorption of water, and avoid wet conditions. In exterior applications the filler must be protected from rain until it is dry and painted over with two coats of paint.

Can I hang something on the repaired spot?

No. Do not nail into it, and do not use it for load bearing applications.

Will it survive a door handle hitting it?

No. Do not use it where load or compression occurs, as the product may be crushed — the manufacturer names the doorknob-against-wall case specifically.

Can I use it on a joint that moves?

No. Where movement occurs, use Selleys No More Gaps instead.

How cold is too cold?

Avoid using below 5°C, and avoid wet conditions.

The filler in the tub has gone stiff — can I save it?

Stir it first. If it is still too dry, add one teaspoon of water and stir again to the consistency you want. Product that has actually hardened should be discarded.

How do I clean up?

With water, before the filler sets. Once cured, it has to be scraped or sanded off.

The paint looks the wrong colour over the repair — did I do something wrong?

Probably not. Some paints may temporarily discolour when applied over the filler but revert to the correct colour once dry.