Long story short, I need to fill these gaps between panels of my kitchen counter. It hasn’t been treated yet. I’m leaning towards wood putty but wanted to see if you had differing opinions.
Welcome to the Bunnings Workshop community @kits. It's great to have you join us and many thanks for your question.
If there is any movement in that board, as in it can be pushed further in to close the gap, I would advise using Sikabond 125g Techgrip Multi-purpose Polyurethane Adhesive and clamping it back into position.
If it has already been glued into position and can no longer move then the only real option I can think of would be to fill the gap with wood putty.
Please let me know if you need further assistance or had questions.
thanks for the response! Little movement unfortunately so couldn’t clamp it together without taking it apart (it was made very poorly by someone else and we are trying to just work with it). Here’s the finish!
would you recommend multiple coats (despite the product being one coat?)
The Timber Protect 1L Satin Water Based One Coat Clear Varnish is designed as a one-coat process. I've used it on a coffee table around four months ago and it has held up very well with just the one coat. If you wish to build the coating up with additional layers I would suggest using a product which is designed for that purpose like Cabot's 1L Water Based Satin Cabothane Clear Polyurethane Timber Varnish. These products will have details of when re-coating should be applied and how to do so.