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Plastic tank swell and blisters

Drywall screw have lots of sharp edges, so while shaking the tank around to clean it out they rough up the internal surface. Gives the epoxy a better chance to bond to the inside of the tank..
Many years ago I sealed an aluminum tank with Creem. The tank should have been etched first. Down the road the Creem (a product of the day) started coming off in big flakes! So good prep is key.
 
Drywall screw have lots of sharp edges, so while shaking the tank around to clean it out they rough up the internal surface. Gives the epoxy a better chance to bond to the inside of the tank..
Many years ago I sealed an aluminum tank with Creem. The tank should have been etched first. Down the road the Creem (a product of the day) started coming off in big flakes! So good prep is key.
 
im just going to put the tank cover on. the paint is ruined. the first tank cover never stretched out to allow the motoguzzi emblems on the side to line up. i have a another tank cover that has no windows.
 

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Follow up to previous post: The tank sat in our crawlspace for 3 months with a computer fan pushing air through it at 68 degF.
Last spring the small bumps were all gone. We use a heat pump, so 68F was the temperature all through the house. Caswell has very specific instructions. Pay attention to the temp of the tank and epoxy before treating. 68F proved to be a bit low. This made the epoxy thicker than ideal. 72F would probably be better, but you get less time to work with. Inside the tank it flowed very slowly, but it gave me 1-1/2 hrs of working time before it stopped flowing, so I think I got good coverage after all.
The tank found it's old shape again, and the bumps (mine were not blisters, but visible in the right light) are gone. Persuasion to get the rear tank bolt in is minimal. I consider this a success and well worth the effort.
 
Imdamnpressive.

As I likely mentioned somewhere "up there" in previous posts in this thread, I never sealed my tank -- too lazy; too skeered :giggle: -- but had two tanks and took annual turns R&R'ing those after rinsing (and rinsing and rinsing), then airdrying until that tank's turn. Same result as you report, but not permanent as the bumps, blister, and swelling returned.

My two "plastic tank" Guzzis are in other younger hands now, so irrelevant to me now, but I admire your industry and courage. Good for you.

Best,

Bill
 
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