Guys

Thanks for that input. In the UK I think what you refer to as latex would be emulsion paint which is water based. When thinning it you just use water and I am not sure if the Flotrol product is available here or is needed with emulsion. It is commonly used for painting walls and is available in matt and silk finishes and in a huge colour range.

I have been using a water based clear varnish (matt) with no problems over one pack spray paint and it seems to be quite durable. Two pack paints are a no-no for me as I don't have the equipment or facilities to use them.

I am going to try a sample panel on a spare wing before committing to the 339 and let you know the results.

John