Bulldogs coach Luke Beveridge wanted a response to his charges' round one capitulation to Melbourne - and he got it, as a nine-goal first quarter paved the way for a 18.7 (115) to 10.7 (67) victory.
The Bulldogs withstood multiple charges from the Suns to condemn them to their first defeat under Damien Hardwick.
Small forward Weightman was magnificent at Ballarat's Mars Stadium, booting four first-quarter majors to set the tone, then going on to equal his career-best haul.
Skipper Marcus Bontempelli (31 disposals, 10 clearances and two goals) and Adam Treloar (27 touches) were typically prolific while Tom Liberatore had an entertaining battle with Matt Rowell.
Ed Richards was excellent off half-back but had to leave the fray with concussion after being collected high by David Swallow early in the final quarter, with the Sun likely to come under match review officer scrutiny.
Recalled young gun Sam Darcy (two goals) also impressed.
The Bulldogs' win was also soured by a first-quarter right shoulder injury to defender Nick Coffield - though his replacement Oskar Baker stepped up to kick three goals, including a wonderful snap from the boundary.
Noah Anderson (24 touches) and Touk Miller (30 touches) were busy for the Suns while Sam Collins marshalled their defence and Ben King booted two goals.
Suns young gun Bailey Humphrey was a late withdrawal with a shoulder injury suffered in training and is awaiting scans to determine the timeline on his return.
Gold Coast were already without co-captain Jarrod Witts (groin).
With the breeze at their backs, the Bulldogs were red-hot, booting the first three goals.
Weightman kicked the opener, then took a huge hanger and converted the Bulldogs' second from the subsequent centre bounce.
Bontempelli goaled from long range on the siren to deliver a 41-point lead at the first change.Â
Gold Coast reduced the deficit to 28 points at half-time, with Weightman's crumbed fifth goal the Bulldogs' only major for the second term.
In a see-sawing third quarter, the Bulldogs booted four goals in a row to stretch their lead to 46 points.
But Gold Coast booted the final three of the term, with two via Nick Holman, to cut the three-quarter time margin to 28 and remain in touching distance.
But early in the fourth, Weightman snapped his sixth to steady the Bulldogs before Bontempelli kicked the sealer.
The Bulldogs (1-1) return to Marvel Stadium to host battling West Coast next Sunday while Gold Coast (2-1) have the bye.
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