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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?

Discussions

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Yonatan24

6 weeks ago

What exactly is that? Looks awesome. Maybe if you step on it and it get's a lot wear: shoes, sand, dirt, water, you should consider a thin coat of epoxy resin?

And don't forget to apply on both sides.

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ambientvoidYonatan24

Reply 6 weeks ago

i saw bicycles with sidecar cargo platforms and thought i'd try something similar with my board, i plan to have swappable platforms for different loads this one will have a big speaker bolted to it for skate meets/critical mass etc and another one is just going to be a plain cargo rack...

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Yonatan24ambientvoid

Reply 6 weeks ago

Awesome, you should post an Instructable if you haven't already!

I don't think UV and yellowing should be such an issue though, it's not like it's going to be in full sunlight 8 hours a day 365 days a year... I don't think you should worry about it.

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ambientvoidYonatan24

Reply 6 weeks ago

I thought about posting an instructable but I don't know anything about how to weld or cnc, these were done on my behalf from my doodles. I just did a passable job of sawing and bolting stuff together haha...

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rickharris

6 weeks ago

Marine varnish will be more water proof than any other but all varnishes will change colour slightly

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ambientvoidrickharris

Reply 6 weeks ago

change colour in the same way wood does when it gets wet or darker than that?

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rickharrisambientvoid

Reply 6 weeks ago

Roughly as if the wood was wet - (try on a test peice)