So should I use something better than matte legal?
Semi-gloss photo paper would be good.
Just hard get in legal size, and ordering A4 from Europe would be expensive.
Quick check including postage from Finland to USA:
Assuming I remember correctly 100 sheets is 15 Euros at my local store.
Reasonable patch: 400 sheets 105 Euros,
Cheapest bulk: 2500 sheets would be 511 Euros (or maybe 2600 sheets 526 Euros as long as weight stays under 30 kilos).
I might get price of paper down a bit as my sisters friend works there.