How to fill this gap in decking

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ive built this decking and the corners are not perfectly cut or have expanded/contracted. I was plannng to put an angled moulding but it is not wide enough. Can I use a caulk/sealant and then use the decking stain that I’ve used elsewhere?
 

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Find a larger bit of moulding or some other wood trim
Given it's relatively comtempary look, you could use aluminium angle or even treadplate angle
 
Thanks @Tigercubrider
I would like to avoid the aluminium angle if possible and thought I had the largest wooden angle available. Back to the drawing board...
 
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A thought guys...
Can I not use a clear outdoor sealant and apply stain over it?
 
A thought guys...
Can I not use a clear outdoor sealant and apply stain over it?

You can't apply stain over silicone but you could use a MS polymer such as clear CT1. The caveat being that you need to apply waterbased finishes over if first- oil based paints take months to cure when applied directly over MS polymers.

A tube of clear CT1 will be about £10.

Thinking about it... if your stain is indeed water based it may be quicker to use the silver coloured CT1.
 
if you are planning any handrails off any sort the newels could cover and support the join
does the construction method allow you to overtighten those joints a bit to hold them closed ???
 

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