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How much is enough glue on Tongue & Groove joinery?12/19
I am really curious what the experts in the industry have to say on hairline cracks on painted or stained wood doors. A lot of people say stained doors don't reveal cracks, however, if you put a dark stain on, it is ever so visually apparent.
I am running a test to compare whether an extra glue coverage on the tongue end would give the joinery that much more strength and durability against moisture. A lot of manufacturers tend to apply less glue to reduce glue squeeze out, hence minimizing clean up time.
In my opinion, not necessarily using more glue is better but more coverage of glue with thin film would really help the wood joints to be more durable.
Let me know what you guys think!
I assume you are talking about the rail and stile joint? Slab door? In the panel? If it is at the rail and stile loint, that crack is always going to be there. Cross grain movement will always show the seam between the two boards, no matter what goes in there. Maybe not at first, but will show up some time if solid wood is used. The biggest concern on glue useage at that seam, is that you don't put in so much glue that you lock in the panel.
One stained doors you can reduce the stain dark hairline by coating the edges with glue to seal them before clamping. If you have a problem with glue showing on the face after sanding use the kind that fluoresces under ultraviolet light. Don't wet wipe glue on ring porous woods, let the bead sit on the surface until it is stiff then shave off.