I recently had John Carpenter sign the inside of my NMM78 and he signed in Sharpie—what can I do to keep the signature from smearing of rubbing off?
I just wouldnt wear it EVER! What are the chances of you getting john carpenters sig again?
I dont plan to I just dont want it to rub off over time lol
Rubber cement works great.
There is some kind of spray that artists use on their charcoal drawings or sketches when they are done to make it so they can’t be smudged. I forget what it’s called, but it’s at any art supply store.
Would that be good? Or would it deteriorate the inside of the latex?
If you use a spray only get a waterbased version. Oil based will eat latex!
Plastidip, contact cement, rubber cement… they all do the trick.
I think hairspray will work actually… that’s what my sister use to seal her drawings, and I’ve used it on some models i painted.
Hairspray does work as a temporary solution. But if you’re wearing the mask your sweat will eventually wear it down exposing the signature again.
There are a few maskmakers that actually use hairspray as a sealant on the outside of the mask.
Hi minion, I’m new here, but I can definitely tell you DO NOT PUT NOTHING ON IT!!! If you’re not going to wear it and you’re not going to store it out in a shed, garage, storage unit or something like that, you don’t have to protect it. As long as the mask is stored in a temperature controlled climate e.g., a house, apartment, condo and etc. the autograph will not wear off. If you put rubber cement, hairspray or other sprays on the autograph, they will eventually yellow or turn some other funky color. By the way, hairspray will eat away at a sharpie mark. Hairspray will make an autograph fuzzy looking. Don’t mess with it & don’t wear it, just put it on a stand and display it. You’ll thank me in 15-20 years. 
Rubber Cement and other sealants may darken the spot where the signature is, but unless the mask is WHITE inside, it is not going to turn yellow or another color.
Most masks I work on are flesh or natural latex color inside so it’s not even that noticeable. I’ve not had any problems in 3-4 years.
I guess all that I’m saying is, why take the chance on spraying something on the mask, when you’re just going to display it in a home and not wear it. As long as it stays dry and out of the sunny window, nothing should happen to the autograph. I’m just going by my experience, with 7-8 racing helmets and 8X10 pictures with Nascar and Indy car drivers on them.
The best to go with to seal signatures on latex masks is sealing the area with “perma wet”.
You can get it here http://www.monstermakers.com/product/perma-wet-gloss-coating.html
I´ve sealed all my Corey Taylor and James Root signatures on my replica and original masks with perma wet and using it to get glossy wet and vibrant finishes 
One of the main considerations is going to be what the signature was actually signed with.
Almost any stars’ table is going to have a pile of Sharpies lined up and ready to go but I would be very hesitant to use them to autograph anything. It is almost a certainty that the ink in a standard Sharpie will degrade on your collectible over time and possibly fade away completely. I have a leather white panel football signed by several NFL players about eight years ago and almost all of the sigs have faded away…I was using a “fine line” Sharpie instead of the larger one…huge mistake ! On paper products ( index cards, etc.), Sharpies have often yellowed around the sig. To me, Sharpies tend to hold up best on glossy photos.
“Sharpie” used to actually sell an “Autograph” marker, supposedly it would never fade or yellow over time but I have’nt seen any of these in a while…not sure if they still make them or not. I had a few at one time but have lost them over the years and cannot remember which items of mine were signed with them so I cant vouch for their stability over time.
IMHO, the best bet would be to find a good ball point pen and use that for mask sigs…think about it this way, Babe Ruth signed all of his ink autographs with a pen, not a marker. I would hate to think what all of those valuable signed baseballs would look like today if he had been using something like a “Sharpie”. 
Necrobump….
Had Mr. Carpenter sign a Nag75k for me last night… so just wondering what have other people done to protect signatures in sharpies? What works…
perma wet
Liquitex Gloss or Matte medium. Thin it with distilled water to use if you have an airbrush. Monstermakers Permawet is the same as liquitex gloss medium. Ive used both to seal latex paint on boots. Heard of some say plasti-dip, never used it however heard it works extremely well.