Finishing sanded floorboards

Hi all,
I just finished sanding the floorboards in my lounge, and as I had expected, the boards are is a very poor condition (gaps, largish holes, etc) and will require a lot of filling (probably PVA glue + sawdust mixed - would wood filler work here as well?).
Whilst I prefer the natural finish, in order to try and make the imperfections less visible I decided to apply some wood dye prior to varnishing.
My plan is to use antique pine dye (http://www.screwfix.com/app/sfd/cat/pro.jsp?ts 074&idF921), floor sealer (http://www.screwfix.com/app/sfd/cat/pro.jsp?ts 074&id391) and Ronseal Diamond Hard varnish.
I have used the sealer before on a similar job, and it saved me at least one coat of varnish (most welcome as it cost less than a third of the price of the varnish). The result was great, so I am looking to repeat the process if possible.
My questions therefore are:
- Does it make sense? - In which order would I apply them (dye, then sealer, then varnish)? - Anything to worry about such as a reaction between the different substances that I should consider? I will of course wait the recommended time between coats.
Many thanks in advance.
J.
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Not exactly related, but have you heard of Os Color (correct spelling - it's foreign) Hardwax oil.
I have used it on several sanded floors and it is excellent. 100% environmentally friendly too as all natural product.
Let me know if you cannot find details on it.
Rob
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