请教个，Spray Foam填完后多久时间CUTTING合适？ 就是把膨胀多余出来的切掉？

1，basement墙与地面间有段发现有条缝隙，想用Spray Foam给填补上，可不可以？
2，查了些信息，Spray Foam厂家说明上“Trims in 1 hour”。 可是很多文章又有写“Wait until the foam cures completely before trimming it. Check the curing time on the spray foam，leave it alone to cure until it has a hard, smooth finish，which is usually between 12–24 hours.
到底是1小时，还是等 12–24 hours彻底固化硬了再切平？会不会彻底固化后太硬，刀锯切不动了？

有经验的大拿们快给说说？谢谢