Dry mounting problem

I tried dry mounting for the first time today, but i have run into some problems. I tried to dry mount a 8x10 print on slightly bigger matboard, i'm using a vevor t shirt press and fixmount ultra with fomabrom V111 paper. I used a tacking iron to stick the foil to the print and to the matboard, this worked fine. The t shirt press is set to 95 degrees (200 fahrenheit) for 2 minutes, but it barely worked at all. The tissue did stick to the paper but with a loose corner and it dind't really stick to the matboard at all. I tried a lower temperature and shorter time but with no result.

The only problems i can think of is the pressure being to little (i could adjust this) or the matboard not being fit for dry mounting (i used 'museumkarton' which i think is Dutch for matboard). Both seem unlikely.
Does anybody know what i'm doing wrong?

Information on the tissue i found online:
FixMount Ultra is a paper coated on both sides with hot-melt adhesive. It is ideally suited for mounting art prints, posters, prints, silk paintings, etc., onto cardboard, hardboard, foam board, etc., with high quality – simply, efficiently, and cost-effectively. Due to the adhesive's low activation temperature, the film is also suitable for mounting photographs, inkjet media, and materials sensitive to high temperatures. FixMount Ultra is pH-neutral and acid-free. It is approximately 50 µm thick and can be processed at temperatures above 80°C. Mounting images with hot-melt adhesive film is remarkably easy. The hot-melt adhesive film is cut slightly larger than the image, aligned with the image on the substrate, and secured with a few spots. The prepared image is then placed between silicone sheets in a preheated heat press for approximately two minutes. The heat melts the hot-melt adhesive film, bonding the image to the substrate. The heat and even pressure largely prevent bubbles or creases. The result is a clean and smooth surface.

Does the press heat on both sides? May be a t-shirt press does not. So the mat board side does not get hot enough as the only preheated side does not have enough stored energy to heat up the mat board sufficiently.

Did you pre-heat the mat board sandwiching the print?
Give it more time and monitor each minute....

Interesting idea, however the naked photographer used the same press with good results on his YT channel. I'll check it out though, maybe it doesn't heat up sufficiently because it has to heat trough 2 matboards.

Ulrich Drolshagen said:

Does the press heat on both sides? May be a t-shirt press does not. So the mat board side does not get hot enough as the only preheated side does not have enough stored energy to heat up the mat board sufficiently.

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GregY said:

Did you pre-heat the mat board sandwiching the print?
Give it more time and monitor each minute....

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Thanks for the reply. I did pre-heat the matboard, i could try a longer time but i couldn't imagine that being the problem. Product information says it should be heated for 2 minutes.

DutchDarkroom said:

Thanks for the reply. I did pre-heat the matboard, i could try a longer time but i couldn't imagine that being the problem. Product information says it should be heated for 2 minutes.

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i've occasionally had that problem w my drymount press..... additional time won't hurt anything. Is it a new t shirt press? are you sure it's at the proper temperature?
The problem is either time or temperature. Afterall....you're using a t shirt press not an actual drymount press.....

I'll try a longer time when i get the chance. I got the press used but it looks like a newer model. I haven't measured the temperature, i just set it on the press. The product information says it works from 80 degrees celsius. What amazes me is that it stuck great when i used the tacking iron at 95 degrees, both on the paper and matboard.

I use a t-shirt press at 200 for about a minute. I've had no problems. Regular matboard and Kodak dry mount tissue.

DutchDarkroom said:

I'll try a longer time when i get the chance. I got the press used but it looks like a newer model. I haven't measured the temperature, i just set it on the press. The product information says it works from 80 degrees celsius. What amazes me is that it stuck great when i used the tacking iron at 95 degrees, both on the paper and matboard.

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but the tacking iron is much typically closer to the tissue..... i tack through release paper. I mount with the print sandwiched between two sheets of mat board. Your tacking iron showed you there's nothing wrong with the product.

I have a massive industrial press, rescued from a London darkroom. I get non-sticking issues if there is any trace of dampness in the mount board or in the protective cards I use to keep the clean materials off the metal.

If humidity could be your problem, try drying everything in the press by warming it up, then taking it out to steam. Two or three such cycles usually does the trick for me.

Does not sound like your press is set hot enough. Dry mount presses usual start near 200F and go up from there. I use 225, and heat through one or two sheets of mat board, but it depends on the tissue. Also, dry mount presses only heat from one side, so that shouldn’t be an issue.

Some mounting tissue does well to cool under pressure. No idea about FixMount Ultra in this respect but you could do the heat and then turn the machine off and let it cool under pressure to test.

Here in my lab we received the new improved Drytac mounting tissue this year, it basically does not stick and I have tried every way to fix and as well sent to another facility and they had the same problem with the new improved tissue.. I am quite pissed off.
My supplier has a new product which he says will stick I am going to give it a go. This is a new problem for heat mounting prints , I have personally used the old stuff for almost 50 years with no problem and now there seems to be big issues.

cowanw said:

Some mounting tissue does well to cool under pressure. No idea about FixMount Ultra in this respect but you could do the heat and then turn the machine off and let it cool under pressure to test.

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Seal presses used to come with a large metal plate to cool under pressure. Leaving the mounted photo in the press off might not help, the press is still quite hot for a while.

cowanw said:

Some mounting tissue does well to cool under pressure. No idea about FixMount Ultra in this respect but you could do the heat and then turn the machine off and let it cool under pressure to test.

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C, the problem with that approach is that you don't find out what time/temperature works.
I'd suggest more time....then check if the tissue has melted and the print adhered. Then let it cool under weight. (I use a piece of tempered glass)