You cannot. A glue stain, or any stain will show through clear varnish. It is always better to try and remove all stains or marks before varnishing. Almost every glue has a solvent that will remove it.
Here's what DIY Wooden Boat website has to say: Maintaining your Boat Varnish. To keep boat varnish looking smart requires regular maintenance. UV rays (sunlight), is the major cause of damage to a varnished finish. All good quality marine varnishes contain UV blockers. Unfortunately these do eventually break down allowing the UV light to penetrate to the base layers. And when it does the base coat will begin to deteriorate and start to separate from the wood leaving you with those horrible opaque blisters. Once the varnish has reached that stage the only option is to strip it all off and start again. To avoid this happening you need to renew the UV protection by regularly sanding back and replacing the top coat. How often this needs doing will depend on the amount of sun it is exposed to, generally once in the spring then again at the end of the season should be sufficient. Not only will this top up the UV protection but it will fill up any scratches or cracks and your varnish will get better looking every year. And filling those scratches will prevent moisture from getting underneath the base coat which will also damage the varnish to wood bond. Here is a quick rough guide to when your varnish needs freshen up.

Give it a good wash, then when it is still wet the water should form beads on the surface.

If the water forms sheets or flattish streaks it's time to re-do that top coat. Even where you are merely touching up sound boat varnish, the surface must be sanded to provide a key so the new varnish will adhere well. Varnish should always be sanded with a fine grit, 150 or less, a course paper will leave scratches which will be impossible to hide. For boat varnish work, always sand along the direction of the grain of the wood and not across it, so it really needs to be done by hand. Where old varnish is lifting, blistered or has flaked it is better to take it all off and start again than to try to patch it up. Start off with a long handled scraper, this is the type of job they are designed for. If there is a lot of thick varnish to be removed you could resort to a hot air gun and a hook scraper or if you are feeling brave a blow torch. I have found that chemical strippers are messy, hazardous to use and work out quite expensive, I'd rather take my chances with a blow torch. Once you have got the old varnish off, or if you are starting from bare wood you then need to give the area a good sanding.
Yes, you can finish the wood with a shellac varnish or any other substitute. Or if you want to paint an opaque color over it (instead of something that will just stain the wood) oil based paints made for the home exteriors will preserve your wood much longer.
You are not. You are by far a better person if you can avoid a fight... Unless you are an MMA fighter and are getting paid or something
Based on a recent interview, recording artist and composer performs with not showing her face to avoid taking attention away from her songs. As an aside, Sia has composed songs for many top recording artists like Katie Perry.
Transmission fluid MUST be changed every year to avoid problems with varnish buildup in the tranny. Ball joints wear alittle quicker than most. Alternators wear out faster (Common to front drive GM vehicles) Water pumps wear out a little faster too. Thats all I have found with my 93.
To maintain a varnish table for longevity and durability, follow these best practices: Clean the table regularly with a soft cloth and mild soap to remove dirt and spills. Avoid placing hot items directly on the table to prevent heat damage. Use coasters or placemats to protect the surface from scratches and moisture. Reapply varnish or protective finish as needed to maintain the table's shine and protection. Keep the table away from direct sunlight and extreme temperatures to prevent fading and warping.
To achieve a smooth wood finish using a wire brush, start by sanding the wood surface to remove any rough spots. Then, lightly brush the wood with the wire brush in the direction of the grain. Be sure to apply even pressure and avoid pressing too hard to prevent damaging the wood. Repeat the brushing process until you achieve the desired smoothness. Finally, finish with a coat of wood sealant or varnish to protect the wood and enhance the finish.
To maintain a wood door frame for longevity and durability, regularly inspect for any signs of damage or wear, keep it clean and dry, apply a protective finish like varnish or paint, and avoid exposure to extreme weather conditions.
Impressionists Impressionism
When applying non-toxic varnish to wood toys for children, it is important to follow these best practices to ensure safety: Use varnish specifically labeled as non-toxic and safe for children's toys. Apply the varnish in a well-ventilated area to avoid inhaling fumes. Allow the varnish to fully cure according to the manufacturer's instructions before giving the toy to a child. Check for any rough or sharp edges on the toy before and after varnishing to prevent injuries. Regularly inspect the toy for wear and tear, and reapply varnish as needed to maintain safety.
To effectively restore the beauty of your hardwood floors through refinishing, you should start by sanding down the old finish, repairing any damage, and applying a new coat of finish. Make sure to follow the manufacturer's instructions and use the right tools and products for the job. Sanding should be done carefully to avoid damaging the wood, and the finish should be applied evenly for a smooth and glossy look.
To prevent the formation of polyurethane bubbles when applying a finish, make sure to stir the polyurethane gently to avoid introducing air bubbles. Apply the finish in thin, even coats using a high-quality brush or applicator. Avoid overworking the finish and allow each coat to dry completely before applying the next one.
They help you by showing all cut and pasted material with sites.
Polyurethane can become sticky if it is exposed to moisture or high humidity during the curing process. This can prevent the polyurethane from drying properly and result in a tacky or sticky finish. It is important to apply polyurethane in a controlled environment with proper ventilation to avoid this issue.
To achieve a smooth finish on rounded edges through sanding, start with a coarse grit sandpaper to shape the edge, then gradually move to finer grit sandpaper to smooth out the surface. Use a sanding block or sponge to maintain even pressure and avoid creating flat spots. Sand in a circular motion to follow the curve of the edge and finish with a final pass using a very fine grit sandpaper for a polished look.
Nothing. It's fairly hard to avoid showing the whites of your eyes.
avoid the excessive heating of base voltage