After a week battling some seams and mainly the yellow wing edge stripes today I managed to paint the under surfaces
First a black meddling

and then the grey green the green on the upper surfaces will follow quickly. I am considering just how the salt water would change the appearance of both colors because of the floaters, so appreciate any ideas and feedback from you chaps. Thanks!

@holzhamer, the spray will have affected the aft fuselage and the propeller the most I think. Very nice progress here. I have to admit I have bought the kit too, and is sucking up all the info on your build! Do you know of any aftermarket items for this one? - I seem to have missed them. One thing in particular is the version with a landing gear, and the version with no gear at all as mentioned in the text in the kit. Could be great fun to make one on a catapult. . . .

Thank you @holzhamer - I found a site after visiting scalemates!
http://wsw-modellbau.de/epages/ncs244425151111.sf/sec18515f30a1/?ObjectPath=/Shops/44425151111/Products/48-P001
That looks rather like a different beast with all-orange paint and all...

Great attention to detail at ever stage, Pedro. This will be a masterpiece when done. I like your approach of doing the hinomarus first and masking them off to do the surrounding paintwork. I was unsuccessful in my efforts to do it the other way round on my Betty.

Very slick paint work

Thank you my friends for your input.
I couldn’t resist myself and placed my one leg model over its cart, just to see how it would look like... without the second floater (the one with the metal ballast) it just keeps leaning backwards eheh

some petit details were added to the right floater as you can see in the photo.
Those yellow ID wing edges will need some minor retouches and then weathering time!

Wow Pedro I totally sleep walked past this gem. interesting process in painting the Hinomarus first and then the paint scheme. I read the whole posting and very nice step by step WIP. Very skillfull in your approach and techniques in getting this one rarely seen Japanese float plane assembled. I do agree it is very sleek and graceful. Will watch as you finalize this very well done Seiran. Thanks for sharing

This will be the best looking Seiran I have yet seen online. I really like the way it is all coming together with sprayed on markings, subtle modulation of the finish on upper and lower surfaces and restrained chipping. Can't wait of the masks to come off - revealing the interior in the last stages is one of my favorites parts of completing a model. Of course it's a bit tense too keeping the paint intact when pealing away masks but I always feel any paint loss is fixable with care.