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Why is polyurethane separating from table after sanding off marine spar varnish?
Wiki User
∙ 11y ago
Often, poly will not adhere due to contaminants on the surface. Remove all of the loose coating, sand the surface, brush off the surface with a brush, then remove the remainder the dust with a tack cloth.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoPolyurethane will not stick to a Marine Spar finish if the surface was not clean or dulled prior to applying the polyurethane.
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Can is apply polyurethane on painted out door wood tables?
Yes, you can use polyurethane on painted glass. It is recommended to use the spray rather than dip though because it will be easier. +++ Test on a small, discreet area first to ensure the polyurethane's solvent won't attack the paint.
Can spar varnish be used over spray paint for exterior use?
Yes, Spar varnish is a marine quality exterior varnish that can be used over many surfaces, however it does have an amber hue that will affect the color of whatever surface is being coated. If you're looking for a long-lasting crystal clear coating then a better choice would be a water-based polyurethane coating.
What is spar urethane?
It's a very good marine quality varnish.
Can you put a marine polyurethane over interior gloss finish?
Yes, you can, but what a waste of money.
What does spar varnish mean and where is it used?
I was wondering the same thing when I found your question. Well, with further research I found the answer is 'not recommended'. Although spar varnish is made for marine use, it never quite dries. It needs to remain a little soft to compensate for the woods flexing in heat and cold or it would crack, so it's not as hard as floor finish.
Can is apply polyurethane on painted out door wood tables?
Yes, you can use polyurethane on painted glass. It is recommended to use the spray rather than dip though because it will be easier. +++ Test on a small, discreet area first to ensure the polyurethane's solvent won't attack the paint.
Can epoxy and polyurethane be mix?
Epoxy and polyurethane can be mixed. An epoxy and polyurethane coating system is often used in the marine industry to protect against the weather.
Can spar varnish be used over spray paint for exterior use?
Yes, Spar varnish is a marine quality exterior varnish that can be used over many surfaces, however it does have an amber hue that will affect the color of whatever surface is being coated. If you're looking for a long-lasting crystal clear coating then a better choice would be a water-based polyurethane coating.
What is spar urethane?
It's a very good marine quality varnish.
Can you put a marine polyurethane over interior gloss finish?
Yes, you can, but what a waste of money.
When did 'Little Ships' marine varnish by British Paints stop being made?
At least 18 years ago
What kind of wood do you use for a picnic table?
Preferably cedar or redwood. The best finish to retain color and minimize damage by weather and UV is marine spar varnish.
What can one do with a Porter cable polisher?
A Porter cable publisher is a tool used for polishing or sanding. It is mostly used on automobiles or marine projects and is pretty light at just five and a half pounds.
What does spar varnish mean and where is it used?
I was wondering the same thing when I found your question. Well, with further research I found the answer is 'not recommended'. Although spar varnish is made for marine use, it never quite dries. It needs to remain a little soft to compensate for the woods flexing in heat and cold or it would crack, so it's not as hard as floor finish.
How do you apply epoxy resin and varnish to a boat?
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.
What water sealant do you recommend for outdoor decks?
I worked for various paint companys, approx. 8 yrs experience. Need to know if u have installed hard wood ( cedar, mahogany, or even 4 x 8 standard wood. Soft wood, pine, fur, etc. You can use a clear exterior polyurethane. Flecto Varathane was the manufacture. Marine Spar Varnish (exterior) can be used. If u have access to a good quality paint store, they will be glad to help. Hope this helps u. Inspector F.H.
Can you mix polyurethane with acrylic paint?
I have always used 'polyurethane' to solidify my acrylic painting projects. My reasoning was to add a 'protective' covering and the wood pieces have lasted for several years and all were gifts to my grandchildren. corino
