While it s best to fill any voids prior to attaching pieces of plywood together you can fill voids between plywood sheets with wood filler.
Filling 4x8 sheet gaps with wood glue.
It s easier to work with especially on wood to wood gluing.
As to filling the gaps don t use some sort of wood filler.
This is the traditional way of creating wood fillers.
Choose that option when the void is large enough and regular in shape like the one shown here.
Wood filler can be used to fill gaps up to an inch wide and an inch deep.
First fill the gap with a small amount of wood glue then rub sawdust into the gap.
If the gap filled portion will be stressed use epoxy.
The last case results usually with a piece too big cut.
6 sawdust with wood glue.
Unless you need to fill a gap titebond iii is the better choice.
Combining sheets of plywood makes the wood project more durable.
If you re simply filling a gap with no strength required use gorilla glue.
Sands easily and dries fast.
Rub the sides of the sliver on sandpaper until it fits the width of the gap perfectly.
The key here is to make sure the sawdust is from the wood project you are currently working on so the color.
Instead use sections of rope.
A smooth cotton rope stuffed into the gap loaded with carpenters glue will stick very well.
They re waterproof gap filling and promise solid end grain to edge grain bonding.
Make joints in woodworks dissapear.
By combining equal parts sawdust and white wood glue it forms a paste that can be used to fill holes.
The new polyurethane hot melt adhesives offer reliable strength and set up almost instantly.
Force glue into the opening with a knife or a piece of paper then slip the filler into place.
No matter you want to repair small nail holes or want to fix some large gaps in the wood it still works fine.
They re expensive and hard to sand after being fully cured.
Use a chisel to take a sliver from another piece of matching wood making it deeper than the gap.
Not only will it be expensive but you will find it will crack out in just about a year due to the seasonal movements of the old floor boards.
Everybody who has tried to make some woodworking knows the frustration that occurs if some pieces leave a huge gap between them when assembled or on the contrary are too tight to fit together.