What's this?

[Loki]

Been cleaning my tank in preparation for pouring in the liner and after getting out all the screws I dropped in there was still something rattling about in the tank, after a lot of shaking and poking got it all out.
It would appear a PO has poured epoxy resin into the tank to seal the bottom although so far I haven't detected any leaks during my cleaning.
Peering through the filler hole with a torch there is still some on the bottom of the tank in places but it seems firmly attached and I don't want to start poking at it in case I cause more issues, hopefully the new sealant will seal over it and form a continuous seal?

 

[grewth]

I wouldn't be happy about trying to seal over it TBH.
Have you thought about using a strong solvent to dissolve it.
People keep making reference to M.E.K. is it ?
Methyl Ethyl Ketone or something very similar.
I've not tried it yet, but it's supposed to rip out tank liner in no time

 

[Raggaren]

This will work.
https://www.google.com/gasearch?q=airplane paint remover&source=sh/x/gs/m2/5#lfId=ChxjMe

 

[grewth]

This will work.
https://www.google.com/gasearch?q=airplane paint remover&source=sh/x/gs/m2/5#lfId=ChxjMe
View attachment 21579

Graham (Loki) is unfortunately based in the UK.
The last time I tried to buy "Aircraft Stripper" , I found that it's not available in the UK due to environmental and H&S issues.
Then I tried to buy some in America and get it shipped to the UK.
Banned by eBay, sale blocked.

 

[Raggaren]

Maybe you can find something similar in the uk.
Jasco paint remover??

Check these out.
https://owatrol-international.com/en/all-our-products/10425-dsp-800.html

https://oneclearwinner.co.uk/produc...YsxwZZpVzQn6YK4tscUJ55zRGWnofAkhoCrXMQAvD_BwE