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Sealer For MDF?

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Forum topic by gfadvm posted 866 days ago 2517 views 0 times favorited 24 replies Add to Favorites Watch
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gfadvm

10538 posts in 1287 days


866 days ago

I just built a 4’x6’ assembly/finishing table and am covering it with MDF. What would be best to seal it to keep glue, finish, etc from sticking to it? Thanks in advance.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm


24 replies so far

View DonnyBahama's profile

DonnyBahama

215 posts in 1128 days


#1 posted 866 days ago

Hi, Andy! I think what most people do is top it off with a sacrificial sheet of 1/8th inch Masonite.

-- Founding member of the (un)Official LumberJock's Frugal Woodworking Society - http://lumberjocks.com/topics/29451

View HorizontalMike's profile

HorizontalMike

6914 posts in 1511 days


#2 posted 866 days ago

Johnson’s Paste Wax, cheap and works well.

-- HorizontalMike -- "Woodpeckers understand..."

View Clint Searl's profile

Clint Searl

1384 posts in 958 days


#3 posted 866 days ago

Varathane waterborne poly for floors.

-- Clint Searl.............We deserve what we tolerate

View Howie's profile

Howie

2656 posts in 1520 days


#4 posted 866 days ago

I used poly on mine then like Mike says,Wax it.

-- Life is good.

View Sawkerf's profile

Sawkerf

1730 posts in 1665 days


#5 posted 866 days ago

I use water based poly – often whatever is in the can from projects. About once a year, I scrape it down and give it a fresh coat.

-- Adversity doesn't build character...................it reveals it.

View gfadvm's profile

gfadvm

10538 posts in 1287 days


#6 posted 866 days ago

Mike, The wax would be easiest but I was comcerned that MDF will just soak up wax like a sponge? No finish under the wax? Donnie, Glad to hear you’re up right and taking air.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View bugz's profile

bugz

773 posts in 1260 days


#7 posted 866 days ago

Andy, I have alot of mdf counter tops in my shop and I put a couple coats of poly on it. You can hit any glue stuck to it, after it drys, with a puddy knife and it peels up. The nice thing about poly is you can scuff it up, hit it with a sander and recoat it and it looks like new. I have built several roll around tool boxes and I put a piece of 1/4” hard masonite on top, so it is easily replaced. Also coated that with poly. Then just plain old johnson floor wax.

-- Bob, Lewistown, Montana. Kindness is the Language the blind can see and deaf can hear. - Mark Twain

View lizardhead's profile

lizardhead

517 posts in 1438 days


#8 posted 866 days ago

I covered mine with a clear sheet of Plexiglas, I just use a 1-1/4” chisel to remove any glue, trust me I use it a lot

-- Lizardhead---Yeah but it's a dry heat--Tempe, Az

View Roger's profile

Roger

14096 posts in 1401 days


#9 posted 866 days ago

I know both water base poly, Johnsons paste wax are gr8. glue comes right off. @lizardhead: plexi? hummm sounds interesting.

-- Roger from KY. Work/Play/Travel Safe. Kentuk55@bellsouth.net

View gfadvm's profile

gfadvm

10538 posts in 1287 days


#10 posted 866 days ago

Thaks for all the quick input. I guess poly won the contest. Now, how many coats should I apply? I think I’ll use water based as I have some that I will never use otherwise (and it should dry quicker).

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View vonhagen's profile

vonhagen

483 posts in 961 days


#11 posted 866 days ago

you could use formica and just contact cement it on and nothing will stick to it but you must use a backer on the other side so it wont warp. my main work bench is 1 3/4×6 poplar frame with 3/4 mdf with standard grade formica and i just use saw horses and level it with shims and it also works on the floor as a nice level flat surface to mock up large pieces. never use wax on your work surface as it will transfer to your wood and screw up your finish

-- no matter what size job big or small do a job right or don't do it at all.

View gfadvm's profile

gfadvm

10538 posts in 1287 days


#12 posted 866 days ago

Hey Blaine, My workbench is covered with Formica and I love it but don’t want to spend $50 to cover this table so Polyacrylic looks like the plan for tomorrow.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View Roger's profile

Roger

14096 posts in 1401 days


#13 posted 866 days ago

I’d say at least 3. my $.02

-- Roger from KY. Work/Play/Travel Safe. Kentuk55@bellsouth.net

View vonhagen's profile

vonhagen

483 posts in 961 days


#14 posted 866 days ago

go poly

-- no matter what size job big or small do a job right or don't do it at all.

View Helkat's profile

Helkat

74 posts in 892 days


#15 posted 865 days ago

I used Spar urethane on mine, about 3 coats as is got sucked in pretty good by the mdf. At the time I was in a basement that flooded regularly, and I was concerned about it sucking up moisture and expanding over time so I did all sides.

Still holding up good for me.

-- Nat, UPstate NY, http://www.cordlessimpactdriverhq.com/

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