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No-one has time to find the correct primers for long term adhesion,
for two such different materials, (hard?) wood and aluminium?Therefore you need an elastic sealant, (not 'caulking', please @withered_preacher),
with good wear and tear resistance, great unprimed adhesion and UV resistance.Good tear resistance rules out (cartridge/ single component) Silicones.
Good wear resistance rules out oil-based mastics and acrylics.
Domestic situation requiring quick skinning/cure time rules out polysulphides.Want to support a firm that supports your hobby?
Soudal Fix All High Tack, item no. 84704 £6.38 from Toolstation
who are operating 'Click'n'Collect' from your local store.
Just note recommended joint dimensions for long term durability,
and,
leave a concave surface to your bead of sealant.Editted to add link to Soudal website page for Tech data.
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Not going to answer the caulking question 😉 because I've been beaten to it.
As far as the filling goes I'd probably use timbabuild if I was doing it for a paying client. Problem there is for a DIY job you will need to buy a tube of the filler £28, the primer ~£30, and the specialised mastic gun ~£50 so for a small job it's a pretty big outlay. As its a step I'm assuming that this is subject to regular use in the summer months so 2 part fillers which are fairly inflexible are likely to fail due to repeated flexing, so brummer is probably your best bet as its slightly more flexible there is also the added bonus that it can be colour matched if you don't want to paint
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I use Toupret Wood Filler (brown pot, ready mixed) for interior and exterior wood. It keeps for months, maybe years even. Properly painted I've not seen failure yet.
Otherwise I use Repaircare and Timbabuild like Bobbo mentioned. It is worth investing in a beginner kit because the tubes last. Repaircare entry cost is £120+. If I had to pick one it would be repaircare, I have Timbabuild because their 1 hour version is useful from time to time.
That and the IR stripper make a great combination for external wood.
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withered_preacher
mespilus
Bobbo
Airhead
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I've just stripped the painted rear wooden step that's under our rear sliding door.
It's looks great but has some small cracks that will need to be filled before repainting. Any recommendations for a decent outdoor wood filler?
Also, I'll probably need to run a bead of some sort of waterproof sealer between the metal door frame and the step. What ever was there seems to have perished. Any recommendations for a product for this also?