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 Post subject: Re: Best ball plug??
 Posted: Thu Apr 26, 2018 4:25 am Post Number: #21 Post
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The few times I've had problems with cracking, I think it was due to over mixing (really fussing over the color) and introducing a lot of air bubbles. I also fill the big thumbs in 2 parts.

How warm is your shop?

The air temperature seems to play a big role in how hot the mix gets and how long it takes to cure. In the winter the shop is 65F, and I need to increase the hardener a little bit (+10%). In the summer (temps more like 75F) I may decrease it a little, or the fill gets a little brittle. This is using 3:1 Pro Choice 6 hour from Innovative.

Other things that seem to improve results - sand hole for good mechanical bond. Blow out and vacuum. Clean area with acetone. I also wait 24 hours or more before touching it, although I might cut it back to within 1/32" and let that sit over night as well.

Steve

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18-19 mph (15.5-16.5 on monitor), 375 rpm, PAP 5 1/2 x 3/8 up, AT: 12*, AR: 45*


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 Post subject: Re: Best ball plug??
 Posted: Thu Apr 26, 2018 3:43 pm Post Number: #22 Post
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Depending on how deep the hole is, with that large a diameter you may have to plug it in three steps. -- JohnP


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 Post subject: Re: Best ball plug??
 Posted: Fri Apr 27, 2018 12:29 am Post Number: #23 Post
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I use CS Hybrid to fill large holes to 3/4 depth, then top it off with Techline.

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PAP: 5.625" x 0
REVRATE: 360
SPEED: 17mph at release
AR: 55º
AT: 7º


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