Repairing thin cracks in wooden windowsills

[stuartjjones]

I have 4 hardwood windowsills that are all showing signs of weathering & need repairing. Pics attached.

IMG_0364.jpg (399.54 KiB) Viewed 539 times

Each is south-facing so receive a lot of sun.

I'm wondering how best to fill these thin cracks. They're too deep to fully sand out, I'd be sacrificing a lot of decent wood.
I've considered Alabtron's Liquid Wood, but I read complaints that this doesn't always harden.
Simply epoxy wood filler may be too 'dry' to get into all of the thin cracks.
Then there's external caulk but I don't have much faith in its longevity outside, even once well painted.

Does anyone have any inspiration? Would love some advice. Thanks.

[dewaltdisney]

I think the best way is to wire brush the wood to remove all the flakey loose stuff. I think car body type filler which is an epoxy mix will fill the voids and make the surface level after a bit of sanding. Have a look at https://www.toolstation.com/search?q=big%20boy%20filler After sanding paint well to finish.

DWD

[stuartjjones]

Thanks DWD - followed your advice and delighted with the result.

[dewaltdisney]

Good, I am glad you got it sorted

DWD

[Tom d'Angler]

delighted with the result

Any chance of some pics?

[BuntyCollox]

Hi Stuart sorry for the late reply on this one. I used to use the 2 part wood / car body fillers on external timber cracks but I found even with the keenest prep, they weren't lasting the tomato season. Timber flexes alot, especially externally and the 2 part fillers just don't flex with it and they were cracking and blowing. There is a product called repair care dry cure, it's f***ing expensive but it's brilliant. I appreciate you've already done the repairs but next time might be worth giving it a try.