As far as I can remember it was just normal PVA. Nothing special it is purely to stop water entering the chipboard inside.
I prefer PVA as a sealant but compound gives a tidier joint, I don't trust it like PVA for water repelling tho
It should be colorfill or silicon as PVA, even exterior, can reactivate when it gets wet. It's good to see that a masons mitre, even when not perfectly sealed, passed the test of time.
I don't remember if compound was around then, it was one of the first jobs I ever worked on. Right in the middle of my apprenticeship too. That is why I still remember it well. The Chippie did the worktop install and I did everything else.
Do a mitre in a rental, that way when it blows you can get the deposit back due to bad worktop joint care!
I suppose you have been doing it much longer than that, what was the preferred method of sealing joints?
You mentioned silicone had been around a long time and PVA shouldn't be used, so what would you prefer to use to seal the cut faces?
I've never seen a metal bar joint blown but I have seen loads of mitred joints blown. -I've never seen a real old shithole kitchen with a bar joint? Unlikely -I've never seen a proper sealed mitre? Unlikely
Actually, you said this: " It should be colorfill or silicon as PVA, even exterior, can reactivate when it gets wet" Referring to both interior and exterior PVA. Idiot
YOU should learn some manners. Chippie had been here a long time and is an expert. How he chooses to give that advice has nothing to do with you. As for his advice I shall take it, and block you. Smart ***.