Fill‑Flex - Flexible & Crack‑Resistant Interior Filler for Tough Surfaces - Elastic Compound for Cracks, Movements & Control Joints - Easy Sand, Paintable - 1 kg

This is a good quality flexible filler which is easy to use.

Our Victorian flat has hairline cracks everywhere. I've had to get quite handy at filling. I spent a long time filling some cracks with regular filler and was pretty annoyed when they opened back up 6 months later. I opened up the cracks again, and refilled with this stuff. The repair has held for a year. I'm keeping my fingers crossed and will only be using this for similar cracks in the future. As per other reviews, this is harder to work with than other filler. It is similar to caulk to apply. Unlike other reviews, I found that it actually sands well if you leave it a week to go off and cure and then come back to it with an orbital or rotary sander. You can then paint over for an invisible repair. Great stuff.

None of the cracks I've ever filled with Fill-Flex have ever come back so I can attest to the product. Rake out crack, brush dust out, fill with this no higher than surface level because it doesn't sand, fine filler over the top, sand, paint. You don't need Zinser guardz, mesh tape, feathering out meters of mud or anything over the top like I see people do for fine cracks. The only thing that lets it down is the weak plastic tub that cracks under almost no pressure, think I would get the tube instead next time.

This really is my favourite filler (along with their fine filler)

This stuff dries rubbery, and isn't really hard enough for sanding. I used it for general filling of holes and cracks, and found that it doesn't sand very well, especially at the edges. It will peel like a skin if applied thinly and the edges won't blend flat with the wall. Probably good for corner cracks where there's movement, but I'm wondering what else this is designed for as it's so difficult to get a flat finish with it.

Did the job and filled the crack before the top coat filler was applied. Hopefully it does not come back! Time will tell.

Great product and easy to use

First thing I would say is - smooth, smooth, smooth - as much as you can, before it dries! Used thinly it goes elasticky and peels off, used thickly it dries hard as rock and my orbital sander struggled to make much impact smoothing it off. I wanted to fix a ceiling crack which a painter and decorator had already 'fixed' twice but kept returning. I cut down some wall repair patches (the ones with the stainless steel mesh) and used this filler to fill/adhere the long crack. I had pre-scraped it so I could use a decent amount of product and not apply it too thinly. I usually over-fill as it's pretty easy to sand repairs to a nice level finish, but this is very challenging to sand so take a bit of care over smoothing it before it dries if you can. I also used a bit of this sparingly on a smaller area and on that one it went like chewing gum when sanding so I peeled it off and reached for the normal filler. It seems to be holding on the ceiling repair so I do think this works, for the right job. It's not for the faint hearted - but I needed something that would hold on a long crack in a bathroom that gets steamy. Overpainted with zinsser mould-resistant paint it looks decent - fingers crossed it stays that way.

Très, très cher et a mis du temps à arriver. Les dates de livraison promises n'ont pas été respectées