Fuel can now be contained! When it escapes from its containment a viscous material will be able to seal small gaps in the container allowing for the structural integrity to remain for a little while longer.

The script works by turning desl into gel when it touches bmtl. The simulation below shows you how you can use this to create a fuel cell with a self sealing technology.



Here is the script.

desl_breach = 0
tpt.el.desl.description="Modified desl"
math.randomseed(os.time())
tpt.setfpscap(50)

function desl_clog(i,x,y,surround_space,nt)
local found_bmtl = false
if tpt.get_property("type",x+1,y)==tpt.el.bmtl.id then
found_bmtl = true
end
if tpt.get_property("type",x-1,y)==tpt.el.bmtl.id then
found_bmtl = true
end
if tpt.get_property("type",x,y+1)==tpt.el.bmtl.id then
found_bmtl = true
end
if tpt.get_property("type",x,y-1)==tpt.el.bmtl.id then
found_bmtl = true
end
if found_bmtl then
tpt.set_property("type","GEL",x,y)
desl_breach = 100
end
end

function text_display()
if desl_breach>=1 then
desl_breach = desl_breach - 1
tpt.drawtext(32,32,"Containment Breach")
end
end

tpt.element_func(desl_clog,tpt.el.desl.id,1)
tpt.register_step(text_display)

Instructions on how to run: https://powdertoy.co.uk/Wiki/W/How_to_run_a_script.html

Special thanks to jacob1 for his help with the code!
Thanks to mniip too