Well there are things scientists or chemists know that maybe you don't...
If you mix very very fine powdered aluminum with iron oxide, put it in a thin paint substance and then apply it to a metal object it can sit there for quite some time very peaceably. If however you apply a small yet sufficient amount of heat and/or flame to that object you have just 'detonated' it's thermionic potential and you have a lovely super-heated, fast burning, metal melting force that can and will cause structural integrity problems depending on the mixture and the amount of material.
Heck, even an amateur rocket guy knows about aluminum powder, as well as how to make 'thermite'...
Adding aluminium powder to Sugar rocket fuel- Static tests - YouTube for example
Now I am not saying this is what happened at the towers... I am just saying you could cause structural stress with enough of this paint in the right mixtures at the right places and you wouldn't need to be planting other types of explosives. So was there any 'painting' going on in the days prior?
By the way it can also be a component of any material, not just liquid paint, you could add it to insulation, you could create a sticky tape with it as an ingredient, you could put it in the stuffing of couches, you could carry it in a baby powder bottle and no one would be the wiser till it was heated up to it's ignition point and then you would see the lovely pyrotechnic sparks.
oh for fuck sake.
termite paint is not going to do shit. The support beams of the WTC towers were fucking huge. Lightly sprinkling on heat uniformly is futile. You'd need hundreds, probably thousands of pounds of thermite to do the job. But hey, you know what else would have even more potential thermal energy than a shitload of thermite? Thousands of pounds of jet fuel and several floors of a massive office building worth of furniture, carpet, cubicle dividers, etc.