The other week I had a go at stripping and re-varnishing a large window frame, which was looking a bit rubbish. It still looks a bit rubbish, but less so. This is what I learnt:
- Doing this properly is a heck of a lot of work, regardless of how you do it. Even once you’ve got the original varnish off, you have to varnish, sand back a bit, varnish again, sand back again, and then varnish a third time. You might also have to sand a third time, I’m not sure because I skipped the sanding entirely, which is probably why the windowsill is not smooth. Also I suspect my brush technique wasn’t great.
- Varnish stripper is pretty much useless if the varnish is dried and cracked, but in this state the wood should be pretty easy to sand.
- Varnish stripper works a lot better on decent condition varnish (or paint), but you have to use a lot and it gives off some horrible fumes. Unless you’re using it on a very small surface, and outdoors, you should use a ventilator mask (NOT a dust mask – they don’t block fumes). Some of them shouldn’t be used indoors at all – check the label.
- It does work surprisingly quickly, though – if it’s going to work, the varnish will start bubbling within a minute or two, and be done within about half an hour. You still have to scrape everything off, though.
- It sounds sensible to use coarse sandpaper if you’re sanding, but it will leave a lot of very visible little scratches which take forever to get out and will show under the varnish. Sanders with a rotary action seem to be particularly bad for this.
- Old, stained wood will usually still be stained under the varnish. You might be able to sand it down to a consistent colour, but not necessarily. It’s probably best to just accept that old things look old.
- A few days spent re-varnishing makes painted wood seem much more appealing.