Sanding Through the Grits and Not Skipping Ahead
module: sanding and finish
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ok. table's built. clamps are off, top's attached, joints are solid. now comes the part everybody wants to rush, and i mean everybody, including me on a bad day.
sanding is boring. i'm not going to pretend otherwise. but this is the part of the table people actually touch for the next twenty years, so it's worth doing right.
the mistake almost everyone makes
you sand at 80 grit for a while, it feels smooth enough, and you jump straight to stain. don't. 80 grit leaves scratches you can't see until stain goes on, and then you see every single one of them, because stain doesn't hide scratches, it highlights them. it soaks into the torn wood fiber and sits there darker than the rest of the board. now you've got a table with racing stripes and no way to fix it except sanding the stain back out, which means starting over.
going through the grits in order is what gets rid of the scratches from the grit before it. skip a step and you're just carrying that damage forward into the finish.
the order i use
- 80 grit — only if you've got mill marks, glue squeeze-out, or the surface is genuinely rough. this step removes material, it's not for polishing.
- 120 grit — knocks down the scratches the 80 left.
- 150 grit — getting smoother, still sand with the grain, not against it.
- 220 grit — this is usually where i stop for most furniture. any finer and you start closing off the wood's pores, and stain won't soak in evenly.
between each grit, wipe the dust off with a rag or a shop vac. if you don't, you're dragging the old grit's dust around with the new paper and it slows you down for nothing.
always sand with the grain. across the grain, even lightly, leaves scratches that show up under finish worse than anything else you'll do wrong in this whole process.
checking your work
run your hand over the surface, not just your eyes. eyes miss things, hands don't. if you feel a rough patch or a ridge, especially where two boards meet, go back over it. good light helps too — a lamp held at a low angle across the surface will show you scratches your eyes skip right past under regular overhead light.
pay extra attention to glue squeeze-out along the joint lines. if you didn't get all the dried glue off during clamp-up, it'll sit there and refuse to take stain, and you'll get a lighter blotchy line right where your apron meets your leg. sand it out now, before finish, not after.
a word on the garage
i've talked before about how the garage gets hot enough in summer to make glue set faster than i want. sanding has its own version of that problem, just a different one — dust and dry air. our air out here is already dry most of the year, and if you're running a fan to move sawdust around while you sand, you're kicking a lot of fine dust into the air right where you're breathing. wear a dust mask, not just for the mess but because fine wood dust in dry conditions hangs in the air a lot longer than you'd think. i learned to just crack the garage door and let some airflow happen instead of trying to fan it all away, and it makes cleanup easier too, since the dust isn't settling on every surface in a six foot radius.
the opinion part
finish is where people rush and it shows. i mean that plainly, not as a lecture. the structure of the table, the joints, the glue-up, all of that is the part people show off. but finish is the part people run their hand over every single day. a table with a slightly out-of-square apron nobody notices. a table with sanding scratches under the stain, everybody notices, they just might not know why it looks off.
i'll say up front, staining evenly is still not my strong suit, especially on pine, which blotches if you look at it wrong. we'll get into that next lesson and i'll show you what's worked for me and what hasn't. i'm not going to pretend i've got it fully figured out, because i don't.
before next time
get your table sanded through 220 and run your hand over every surface, especially the joints, before you call it done. if you find a rough spot, fix it now, because it only gets harder to fix once there's finish on top of it.