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<blockquote data-quote="OnOff" data-source="post: 324231" data-attributes="member: 16173"><p>No worries. Reading suggests smearing silicon sealant in the depression between copper pipe and ali back sheet to aid heat transfer and protect against electrolytic reaction - I guess OK if you're excluding moisture from the "interface" it should work.........they say to paint it all black AFTER they've been "siliconed" together. I wonder whether better to paint the ali sheet and pipework separately THEN silicon together, i.e. adding another layer (of paint) to guard against a reaction. Other reading suggests indeed smearing with heat transfer paste!</p><p></p><p>Got to find myself a cheap 15mm, 5/8" or 17mm round nose router cutter (maybe called a "core box bit") so I can cut round bottom grooves in a lump of hardwood to make a former..............plenty available from the States, Hong Kong etc for less than a fiver but here, still looking!</p></blockquote><p></p>
[QUOTE="OnOff, post: 324231, member: 16173"] No worries. Reading suggests smearing silicon sealant in the depression between copper pipe and ali back sheet to aid heat transfer and protect against electrolytic reaction - I guess OK if you're excluding moisture from the "interface" it should work.........they say to paint it all black AFTER they've been "siliconed" together. I wonder whether better to paint the ali sheet and pipework separately THEN silicon together, i.e. adding another layer (of paint) to guard against a reaction. Other reading suggests indeed smearing with heat transfer paste! Got to find myself a cheap 15mm, 5/8" or 17mm round nose router cutter (maybe called a "core box bit") so I can cut round bottom grooves in a lump of hardwood to make a former..............plenty available from the States, Hong Kong etc for less than a fiver but here, still looking! [/QUOTE]
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