Seal pond in concrete

[Ernfrid]

Hello!

I have a concrete pond that previously had a type of pool liner as a sealant. But we removed it a few years ago.

Is there a cheaper alternative to seal the concrete? Tried filling it but it's leaking out and I don't see any cracks.

I have several liters of roof sealant, I believe it's bitumen. Could I paint the inside with that to make it waterproof?

https://www.biltema.se/bygg/kemikalier/asfalt/takmassa-2000023370

 

[Jan_G]

Pond liner?
Available in PVC from about 25 SEK/sqm and in rubber for roughly 3 times more.

 

[Ernfrid]

Pond liner?
Available in PVC from about 25 SEK/sqm and in Rubber for roughly 3 times more.

Can't find anything that cheap nearby when I search for pond liner.

I was mostly considering that I had a bucket of roofing mass at home.

 

[Ernfrid]

Can't find anything so cheap nearby when I search for pond liner.

I mostly thought that I had a bucket of roofing compound at home

https://www.biltema.se/fritid/tradgard/presenningar/presenning-180-gm2-2000040384

Tarpaulin is PVC, right?

 

[Jan_G]

I don't know where you live but this is available to purchase online: https://www.hornbach.se/shop/Dammdu...sHfbX9MXxAcNrZ1iBLcRkzKTBJnRSeQ4aArsYEALw_wcB 12 m2 for 299:-

 

[Ernfrid]

Now I don't know where you live but this can be purchased online:
[link]
12 m2 for 299:

I have byggmax, jula, and biltema nearby, I was planning to try to find a cheap solution today.