Posted by Barrie Lever on 01/05/2019 08:27:51:
I use Ink jet printable water slide transfers which I buy on Ebay (Mr Decal Paper).
There are limitations with these, they really work best with a very light background (white is best), they don't have great adhesive strength.
Aftre printing I spray the whole sheet with a clear laquer, once applied I spray over them with clear laquer, this is OK for me as the models I am using them on benifit from an overall laquer finish.
Next time that I print some decals I will key the top face of the decal paper with 600-800 abrasive paper as I have had some issues with the first coat of laquer bonding to the clear carrier of the decal.
Barrie

I use an initial coat of Windsor and Netown gloss spray laquer, then a few more layers of that or polyurethane spray varnish to seal and strengthen the decal before I cut it out. The W&N lacquer gives a stronger, more consistent and smooth coat than most sprays, but it is designed to be removable with solvent so it need further sealing. I've managed up to about 6" across this way.
Once applied I use whatever finish I had planned for the model.
Don't forget you can get white decal paper – but you need to cut it to the required shape.