Grainfix — Two-Part Wood Repair Kit (Filler, Hardener & Spatula)
Someone knocks and you already know where their eyes are going to land. Two parts mixed on a spatula, and by tonight it's a door frame again — nothing to notice, nothing to explain.
will it match?** — The kit cures brown, and your bonus guide walks you through tinting and paint-matching before you touch the door. You test on a scrap first, so you see the match in daylight before it goes anywhere near the frame.
The filler stays workable while you shape it, so a bad pass gets wiped and redone rather than set in place.
If it dries wrong, you sand it back and go again.
Your order is dispatched within 24–48 hours and typically arrives within 5–9 business days.
You'll get a tracking link the moment it ships, so you can follow it door to door.
Ordering from outside the US?
Allow 7–10 business days.
Every order is covered by our 60-day invisible-door promise, starting the day your order arrives.
Many issues are solved without sending anything back — damaged, wrong, or ill-fitting items are typically replaced free.
No extra taxes or shipping charges.
What you see is what you pay.
Your door goes back to being just a door
Someone comes to the door and their eyes drop to the corner at dog-height before they land on your face.
You stopped seeing it months ago.
They see it in a second.
The worst part isn't the wood — it's that you've started managing who sees it.
It bonds into the wood, not onto it
Hardware-store putty sits in the hole like a plug.
It dries a flat, chalky grey, and the day you sand it you find out it's a different colour than anything else on the frame.
Grainfix is two parts: a filler and a hardener you mix on the spatula.
The mix penetrates the torn fibers and cures harder than the wood around it, colour- and grain-matched, so light hits it the same way it hits the rest of the frame.
That's the whole difference.
A patch is something you spot.
This reads as wood.
Still invisible a year from now
The question nobody asks out loud: what happens when he goes back to the same spot?
Because he will.
That corner is his corner.
Cured Grainfix is harder than the pine or oak it replaced, so it doesn't crumble out the way soft putty does when a door gets slammed or a dog gets bored.
And if the spray goes on after — bitter, clear, dries invisible — he loses interest in that corner entirely.
You fix it once.
Not every spring.
How it works
Three steps, one sitting, no tools you don't already own.
What that corner has already cost you
You could spend each year:
- $300+ per opening to have a carpenter pull and replace a chewed jamb
- $8 for the tube of hardware-store filler that dried grey and made it more obvious
- Your deposit, if you rent — the one you've quietly written off already
One kit, one Saturday morning, and the corner stops being a line item in your head.
The colour-match guide, free with your kit — *Match your door in three steps, even if it's painted white*
A $9.99 value, yours free with every Grainfix purchase.
- The tint test: mix a pea-sized amount on a scrap, hold it against the frame in daylight, and adjust before you touch the door
- The five-minute paint match for white and coloured frames — which primer to use so the patch doesn't flash through
- The grain-drag trick with the spatula edge that makes the repair read as wood grain instead of a smooth spot
Limited-time offer, available today only
Grainfix against the tube in the drawer
See why customers switch and stay.
PREMIUM
Others
Ordinary doors, photographed by owners
Not our lighting, not our frames. These are the ones customers sent in after the fact.
Customer reviews
Questions, answered
will it actually match?
— The kit cures a brown tone, and on its own that will not match a white or very light frame.
That is exactly what the free colour-match guide is for: it walks you through tinting the mix and paint-matching for white and coloured frames, and it has you test on scrap wood in daylight before the door.
Do that step and you see the match before you commit to it.
The mix stays workable while you shape it, so a bad pass wipes off the frame rather than setting in place.
And if it cures wrong, you sand it back flush and do it again — you can't reach a point where the damage is worse than the chewing already made it.
Cured Grainfix is harder than the pine or oak it replaced, so it doesn't crumble out the way soft putty does.
If he's a repeat offender at that specific corner, the Chew-Stop spray goes on after and dries clear on wood.
One kit covers a typical chewed corner or jamb edge at dog-height.
If the damage runs floor-to-knee on more than one frame, or you've got a second door he also got at, order two — that's why the 2× tier exists.
Your order is dispatched within 24–48 hours and typically arrives within 5–9 business days.
You'll get a tracking link the moment it ships, so you can follow it door to door.
Ordering from outside the US?
Allow 7–10 business days.
Fix your frame with Grainfix and live with it for 60 days.
If one guest asks what happened to your door, email us and we refund every cent — and you keep the kit.
60-day invisible-door promise
"Fix your door frame with Grainfix and live with it for 60 days. If one guest asks what happened to your door, email us and we refund every cent — keep the kit."
You'll know within a week whether this worked, but we'd rather you had two months.
Claim your 50% off
Fix it once. Stop noticing it.