Tetrion All-Purpose Filler Review

Updated May 26, 2024 | Posted Apr 30, 2020 | Sundries, Product Reviews | 6 comments

Tetrion All-Purpose filler is designed to be the Swiss Army knife of fillers! Available online, you can use it both internally and externally on a range of substrates such as plaster, masonry and even timber work. You can fill holes up to 5mm deep and the drying time is normally around 2 hours. That said, you’re looking at 24 hours before you can paint over it! I’ll explain why further down the blog. This is my Tetrion All-Purpose filler review.

It is very easy to mix Tetrion All-Purpose filler to a fine, smooth consistency, which makes applying the it very easy too. Sanding the filler once set is nice and straight forward. It is an extremely fine powder filler so hiding blemishes is no problem at all.


Tetrion All-Purpose on Interior walls Review


I used to use Tetrion all the time on interior projects. As mentioned above, it is nice and easy to work with and the results are stunning. The only issue is that 24-hour recoat time!! You just can’t paint over it on the same day and it is a real letdown. This is down to the filler (due to it also needing to stand up to the Great British weather) contains a small amount of cement.

If you try to paint over the filler before it has had time to cure, the cement will burn through your emulsion and it’ll flash. Sometimes this problem occurs even when you do abide by the 24-hour drying time and it is more prolific with certain paints. The only way round it is to prime the filler with an alkaline resistant primer like gardz!!

I have switched over to Gyproc Easi-fill for interior walls and ceilings now. Easi-fil can only be used for this task really, but it outperforms Tetrion All-Purpose filler and it’s a whole lot cheaper.



Tetrion All-Purpose the Masonry Filler Review


I have used Tetrion All-Purpose filler on exterior masonry many times in the past. Because it is so smooth, it is the perfect product to work into hairline cracks in masonry walls or sills. You’ll find it very easy to blend with the rest of the substrate. I expect a longer drying time for an exterior filler too, so the 24-hour wait in-between filling and painting doesn’t bother me too much.

The issue I have when using Tetrion All-Purpose filler on exterior masonry work is the longevity of the product. It’s pants!! Say you fill a load of windowsills with it, the filler dries, then it rains. The filler just turns to mush again! A product which we are led to believe is capable of being used on the outside of a building turns to mush when it gets wet?? There is something not right with that.

I’ll give you another example. We painted the exterior render on a big bungalow a few years ago. Normal procedure, carved out hairline cracks, brushed in Tetrion All-Purpose filler, then applied two full coats of Dulux Trade smooth masonry paint. It looked great after we’d finished! We then got a call to go back the following summer. A few of the bigger imperfections we had filled using Tetrion had failed and come away from the rest of the wall. Everything was dry when we initially did the work. Maybe the render holds a bit of water during wet winter months and the filler was the weakest part of the substrate? Maybe the parts where the filler had failed were just problem areas anyway? Who knows, but after we had to go and fix that job, I never used Tetrion on an external again. I use Toupret murex now and its bang on.


Tetrion All-Purpose the Wood Filler Review


Tetrion is easy to shape and manipulate so its relatively easy to use on timber. I wouldn’t recommend it for exterior timber for the reasons I mentioned above. I wouldn’t use it for any bigger blemishes on interior timber either. Simply because surrounding timber tends to draw water from powder fillers like these and swell up. You don’t notice at the time, but after you’ve sanded your filler and painted over, the timber shrinks but your filler doesn’t. This makes a bulge where the filler is.

The only time I probably would use Tetrion All-Purpose filler on internal woodwork is on little pinholes on door architraves and things like that, but then again you can use any filler for pinholes.




Yes, Tetrion All-Purpose filler can be used in a multitude of situations, but because they’ve tried to make a filler to do every single job, it doesn’t do any job well. There are better products out there for every situation you’re going to come across. Yes, you will need a variety of products, but that’s just the way it is.

If you still want to buy Tetrion, head over to Dulux Decorating Centre, or click here to see latest prices.

If you’re looking for something that will perform better than tetrion for interior filling then try the Gyproc range. They don’t try and do everything, but what they do try to do, they do well. Another brand to look out for is Toupret, who do a whole range of different fillers for different specific jobs.


Review Summary

Tetrion All-Purpose Filler Review - Decorator's forum UK

A general-purpose filler used to repair imperfections to walls, ceiling, and woodwork, inside or out.

Product Brand: Tetrion

Editor's Rating:


  • Easy to mix.
  • Smooth consistency.
  • Easy to use.


  • Extended curing time before you can paint over it.
  • Paint ‘flashes’ because of the cement content.
  • Repairs don’t last outside, which can ruin a paint job.
  • It contains too much water for large repairs on wood.

Updated May 26, 2024 | Posted Apr 30, 2020 | 6 comments

About the Author

About the Author

Mike Gregory is a Professional Painter and Decorator who works in the Northwest of England. He mainly sub-contracts for large decorating firms and works on a wide variety of projects.


  1. Trevor Henson

    Don’t like all purpose fillers mainly use interior filler or exterior right filler for the right job for me

  2. richard

    This stuff takes an absolute age to dry and it’s FLASH like flash Gordon.
    Tourpret or even cheaper Prestonnett is good alternative.
    Good old easy fill for bulk.

  3. Chris

    Glad I came across this. Great information. I use easi fill on interior walls and ceilings too as it’s a perfect finish especially if you combine it with a mirka orbital sander.

    Thanks for the recommendation on the toupret murex For exterior masonry repairs.

  4. John Fallon

    Well ,Iam not a tradesman but reasonably handy at DIY.I needed to patch a interior wall area about a meter square so rather than get a plasterer , I decided to give it a go.I picked up some Tetrion —Hard as a rock and it did a brilliant job. I had never heard of or used this
    previously but used it again because it was great.I have since noticed that they do 2 different fillers , one General purpose filler , and Hard as a rock which they say is for exterior use. Have not tried the exterior one outside so can’t comment but will soon.

  5. Jack Wardley

    it works fine on exteriors you have to seal it with a oil based primer i normally seal it with a oil alkali resisting primer i made the mistake when i first stated out and it cost me my reputation in that area before i really had one cost me a lot of money on top of that as well thats was my fault for not reading the product info lesson learn’t in the most painful way possible.

  6. Yavor

    Great review! Is it ok to use Tetrion all purpose for a surface cracks on a poorly ventilated bathroom walls and ceiling? The cracks are in the fine white cement finish that I intend to prime with a vinyl based alcaline resistant primer and then paint with latex?


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