Yes.
From a post I made last year, to someone asking a similar question.
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Get yourself two plain white cotton handkerchiefs (coloured will do, as long as they have been well washed or used before).
Alternatively, cotton pillow cases.
Put your iron on it's hottest setting(cotton) - ( no steam ).
Spread out the shirt to reveal the area for the patch to be affixed, usually the sleeve. And get the area as flat as possible. Place one of the folded hankie/pillowcases inside the sleeve and flatten. Use the other handkerchief/pillow case on top and iron the sleeve flat.
Carefully place the patch in possition( carefully ! There's no second chance once heat is applied).
Place the hankie/pillow case over the patch and iron for about ten seconds whilst applying some downdard pressure onto the iron/shirt.
Remove the top hankie, and let cool for about ten-fifteen seconds( blow or use a fan).
Carefully use your fingernail along the edge to see if the patch has fully adhered. If it hasn't, then repeat process.
Once it's fully stuck lift sleeve away from lower hankie/pillow case to make sure none of the adhesive has travelled through (very unlikely with propper lextra patches etc).
Then cool off the shirt by wafting it around for a minute or two. There you go!
NOTE: With these types of patches, you should not wash the shirt for 24-48 hours after applying the patch, in order that the adhesive fully cures.
If the patch has a protective film on it, just use it with the film intact as that is how it's supposed to be used. After applying the patch, peel the film off carefully as the patch is cooling down(still warm to hot), but not too cool or cold, as they tend to stick.
