Many people have contacted me concerning the specific mixing instructions to make homemade blotch control and specifics as to its application. So here they are.
Glue size is most commonly made of a watered-down, water-based, PVA adhesive. If you do plan to make your own, try something on the order of 10 parts (or a little less) water to one part Gorilla White Wood Glue. The ratios may vary with species and porosity of the wood.
Distilled Water (Can be purchased in most Grocery stores)
Gorilla White Wood Glue
Glass/Plastic Jar with cover for mixing and storage
Cotton Cloths (clean and pre-washed)
Note: On one of my previous projects, I used Gorilla White Wood Glue at a ratio of approximately 1 part glue to 8 parts water and in worked well as compared to a commercially produced water based pre-stain/blotch control formulation at about 25% of the cost.
Always make test applications using pieces of scrap wood from the same project you plan to finish. You also may find the results will be different from project to project using the same species of wood.
You can also spray the Homemade Glue Sizing/Blotch Control by applying a full wet soaking coat of homemade conditioner, and then follow step 2 through step 7 below.
How to apply the Homemade Glue Sizing/Blotch Control/Conditioner
1. Always stir well before using. Apply a wet soaking coat of homemade conditioner to the final sanded project with a brush or cloth. You want the mix to be absorbed by the soft grains within the wood, thereby balancing absorption of the surface to subsequent coatings.
2. Allow a few minutes for the conditioner to be absorbed into the wood. Then wipe the surface of the wood with a clean cotton cloth dampened with the conditioner to insure total coverage and removal of the excess.
3. Allow the surface to dry. This will vary depending on ambient temperature and humidity. Best guess is 1-2 hours and it is ok to leave for longer.
4. At this point because the wood gain has risen due to the water in the conditioner, lightly sand the surface with 280 or finer grit sandpaper so as to remove the raised grain. Clean the surfaces with a vacuum or dry cotton cloth to remove any dust left after sanding.
5. Apply the second coat of the conditioner following the same procedures as in step 1 and step 2.
6. Allow the second coat of the conditioner to dry overnight; then very lightly sand the wood surface with 280-600 grit sandpaper. I usually use 400 grit wet-dry sandpaper as I always have it in the shop. Make sure you do not over sand the conditioner which will break the seal into the grain of the wood.
7. At this point clean the surfaces with a vacuum or dry cotton cloth. Some blow it off with air but this will scatter dust particles into the air and may contaminate your finish. If you must or prefer to use air then take the project outside vs in the same area you are using to apply finish. Some use a de-waxed tack cloth to remove any dust left over from the sanding, however, this may cause problems for some finishes and I do not recommend using them. You are now ready for your stain or dye and top finish.
See suggestions below when applying coloring products over the Homemade Glue Sizing/Blotch Control.
Recommendations when Applying Stains and Dies
When applying gel stains or oil based stains; you might be able to use just one coat of the Homemade Glue Sizing/Blotch Control; however, you should make a test on scraps to be insure the results meet with your approval.
When applying waterborne dyes and stains over the Homemade Glue Sizing/Blotch Control, apply as normally done, but avoid over wetting and excessive wiping as it may cause the Homemade Glue Sizing/Blotch Control to soften and reduce its effectiveness.
When applying Alcohol/Lacquer/Acetone/Xylol base dyes and stains, they must be sprayed.
Water Base Pre-Stain Conditioner (Homemade) Instructions
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-- Respectfully, Paul