painting exterior wooden conservatory

Just re use the decking oil, other brads are available.

 

I agree with Astra - decking oil is dead easy stuff to use, gives a great finish and works well to repel water. Doesn't crack or peel either.

However, it doesn't preserve the timber, just helps to keep it from drying out, and repels water.

Softwood frames rely on the preservative treatment they were given when first produced, and its effect will be progressively lost over time, probably by the effects of water penetration.

Joints (end grain) are particularly vulnerable, and very much so if they weren't given further treatment after having been cut.

If the connie framework is nicely weathered and a bit porous, I'd personally be tempted to first give it a liberal dosing with something like Everbuild's 'Lumberjack' Triple-Action Wood Treatment (many other makes available, of course).

These products are great. Water-based, no smell, doesn't stain, soaks in nicely. And does a darned good job of killing any existing rot, and preserving against any future.

Wait until the timber is bone dry - no rain for a goodly few days - and apply by brush allowing it to soak well in. Also allow it to 'pool' wherever rain would do so - eg where the verticals meet your cills - and around joints, etc.

Allow to fully dry, and then apply yer decking oil. Give it at least two coats of D/O, and then you should be good for a single top-up every couple of years or so.

If you apply your D/O and get the right shade first coat and don't want it going any darker, chust use clear for subsequent coats.

(Any chance of before and after photos? I'd love to see how it turns out ).