Cadstat
Well Known Member
In the couse of several repair over 6 months, I finally figured out how to deal with proseal. I read all the posts, gleaned the info, and you should too but here's what works for me.
Temperature is the trick. Summer helps but not enough. I pre-heat the proseal in an old cooler with a light bulb. It's 90 degrees or so. I weight the proseal in two separate parts using a cheap gram scale from Harbor frt. I put proseal on two playing card with a pop cycle stick and never try a batch smaller than 3 grams of black to 30 grams white. This will get you close but only within a gram. You need to look at the color and adjust if necessary. I scrape the two onto a metal serving tray and mix with a 1" puddy knife. You can see the 'streaks' very easily as you mix the two. I work in front of a wood stove with a blower in the garage. The tanks are warm to the touch and using a small disposable brush trimmed to 1/4", I paint the proseal on the location. If the mixture cools, I place the metal tray on the stove, wipe the puddy knife across it again, build a glob and warm it until the proseal flows again. It's like honey not peanut butter. This takes only several seconds. Wear nitrile gloves, throw every thing away but the tray and puddy knife, clean up with MEK outside in the yard. Save a little from every batch on a piece of aluminum and date it. Look for variation in color from previous samples. Too gray and it takes long to set, charcoal less time. Keeping the tanks warm speeds the set time.
Temperature is the trick. Summer helps but not enough. I pre-heat the proseal in an old cooler with a light bulb. It's 90 degrees or so. I weight the proseal in two separate parts using a cheap gram scale from Harbor frt. I put proseal on two playing card with a pop cycle stick and never try a batch smaller than 3 grams of black to 30 grams white. This will get you close but only within a gram. You need to look at the color and adjust if necessary. I scrape the two onto a metal serving tray and mix with a 1" puddy knife. You can see the 'streaks' very easily as you mix the two. I work in front of a wood stove with a blower in the garage. The tanks are warm to the touch and using a small disposable brush trimmed to 1/4", I paint the proseal on the location. If the mixture cools, I place the metal tray on the stove, wipe the puddy knife across it again, build a glob and warm it until the proseal flows again. It's like honey not peanut butter. This takes only several seconds. Wear nitrile gloves, throw every thing away but the tray and puddy knife, clean up with MEK outside in the yard. Save a little from every batch on a piece of aluminum and date it. Look for variation in color from previous samples. Too gray and it takes long to set, charcoal less time. Keeping the tanks warm speeds the set time.
