Wood varnish questions Answered
i want to varnish this birch plywood platform to keep it as waterproof and UV resistant as possible but also keep it as close to it's original pale birch colour as possible. i've never varnished anything before so i've been googling for answers and i'm getting some conflicting information, i've been looking at different clear outdoor varnishes and most claim to protect against UV light and not leave a yellow tint but most reviews say otherwise and some general varnishing info articles claim that clear varnish can't protect against UV at all and i'd need a dark stain which i really don't want.
so what can i do to protect the wood against the elements and maintain the colour as much as possible?
can i combine varnish with other stuff?
i found some clear 'marine varnish' is this heavier duty than normal wood varnish or something?
is there an alternative to varnish that will have a similar effect?
if i need to modify the platform later, cutting bits out or drilling new holes is it ok to just apply another layer of varnish to reseal it or will it need preparing in some way or some additional step?