A few years ago, I coated my stair door with varnish. It is now looking very stressed. My question is can I use new varnish (the same type and make) without sanding? Regards.
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If it's the outside of a wood door, you may have used the wrong type of varnish. The outsides of wood doors need to be coated with a Marine Varnish with UV protection. Marine Varnish is used on boats and such, as it protects against moisture and sun damage. No matter what you use this time, I'm sorry to say that you WILL have to do some sanding. The current finish probably won't let a new finish adhere to it. You'll need to make sure the door surface is clean and dry, sand it well to get rid of the "stressed" finish, make sure to get rid of any sanding residue, then coat with the Marine Varnish.
You say your 'stair' door so that sounds like it may be an inside door?
I really doubt that you can revarnish this door without sanding off the old finish or using a paint stripper.
Either job will not be an easy one and may be very difficult if it is a door that you cannot take down and lay flat to work on - it may take several days to sand/strip and then it will take several coats of new paint/varnish and drying periods in between coats.
homeguides.sfgate.com/
I would suggest you pay a visit to either Ace or True Value Hardware store or maybe Home Depot as these stores have qualified people to help with projects like this. They usually have leaflets with instructions and precautions as well as any supplies you may need.
I would suggest you have pictures of your door, brand of varnish you used (and intend to use) and seek their advice on how you might be able to DIY.
In situations that could easily turn out to be disastrous (and costly), it is usually best to consult a knowledgeable person so you may not have to do it twice.
The internet has good links but they do not have complete facts about your situation.
It varies, here is a link on how to - thefinishingstore.com/
I would recommend that you strip off the old varnish, sand down the door a bit before you varnish it again. When you add a new coat of varnish over the old varnish this can cause some issues with cracking and peeling.
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