Everbuild's StixAll. OK it does come in 300 ml cartridges but you could dispense some into pot and apply from the pot.
I've been using STIXALL for some time now , and it does what it says on the tube , with out the smell, yes the cartridges are a pain but I've just been drilling a small hole in the endcap where the nozzle screws on, squeezing out what's needed and putting masking tape over the hole and screw the nozzle back on , it seems to be working, once you squeeze out the solid slug that'll be there it's still usable , had no success with putting some in a jar with a lid on , it all set very quickly , don't know if it's the air that sets off curing or sunlight .
Epoxy or even Araldite struggles on anything to plastic , I think plastics are oily even if rubbed down and they cant grip properly .
Bill