The cheap printers does his work very well, but the printed photos are very sensitive:
any droplet of water ruins them.
The "photo" paper to print photos is very expensive. The normal paper provides regular results.
I used normal 75g A4 paper for this try. My printer is a HP multifunction 1200 series.
Step 1: The Recipe
You can protect them very fastly, easily and cheaply.
-An iron whith temperature control
-a stearin or paraffin candle
-a casserole or pot
Step 2: Doing
--Set the iron temperature in LOW-MIDI.
--Connect it to the electric line.
--Put the iron over the casserole, with the hot plate up.
--Put the paper over the hot plate. The print can be up or down.
--Slide the candle over the surface. The paraffine must melt and impregnate the paper
Step 3: Reviewing the Work
Obviously, the result of the above process is uneven. We need to remove excess wax.
You can use kitchen towels, scrap paper, or so. I used printed paper. The clean face is touching the fotos.
Below I put another sheet of paper.
Then carefully slide the plate on the paper sandwich.
Excess paraffin was absorbed by the top and bottom papers.
Step 4: Ending
Analyzing the back of the photos, you can see is lacking some paraffin. It should be uniform, do the work again for this points.
Now, the photos are almost water-proof!
Another way to preserve your photos is to use spray colorless varnish, in 3 or 4 layers. The problem is that the varnish is never really colorless, and the photos gets yellow.